diff --git a/audio/test/low_bandwidth_audio_test.py b/audio/test/low_bandwidth_audio_test.py
index cc6a70e..44ad1a1 100755
--- a/audio/test/low_bandwidth_audio_test.py
+++ b/audio/test/low_bandwidth_audio_test.py
@@ -57,10 +57,8 @@
   parser.add_argument('--adb-path', help='Path to adb binary.', default='adb')
   parser.add_argument('--num-retries', default='0',
                       help='Number of times to retry the test on Android.')
-  parser.add_argument('--isolated-script-test-perf-output', default=None,
+  parser.add_argument('--isolated_script_test_perf_output', default=None,
       help='Path to store perf results in chartjson format.')
-  parser.add_argument('--isolated-script-test-output', default=None,
-      help='Path to output an empty JSON file which Chromium infra requires.')
   parser.add_argument('--extra-test-args', default=[], action='append',
       help='Extra args to path to the test binary.')
 
@@ -301,10 +299,6 @@
     with open(args.isolated_script_test_perf_output, 'w') as f:
       json.dump({"format_version": "1.0", "charts": charts}, f)
 
-  if args.isolated_script_test_output:
-    with open(args.isolated_script_test_output, 'w') as f:
-      json.dump({"version": 3}, f)
-
   return test_process.wait()
 
 
diff --git a/test/test_main_lib.cc b/test/test_main_lib.cc
index 8c5813c..f954a5e 100644
--- a/test/test_main_lib.cc
+++ b/test/test_main_lib.cc
@@ -60,11 +60,6 @@
 
 #else
 
-ABSL_FLAG(std::string,
-          isolated_script_test_output,
-          "",
-          "Path to output an empty JSON file which Chromium infra requires.");
-
 ABSL_FLAG(
     std::string,
     isolated_script_test_perf_output,
@@ -190,14 +185,6 @@
     if (metrics_to_plot) {
       webrtc::test::PrintPlottableResults(*metrics_to_plot);
     }
-
-    std::string result_filename =
-        absl::GetFlag(FLAGS_isolated_script_test_output);
-    if (!result_filename.empty()) {
-      std::ofstream result_file(result_filename);
-      result_file << "{\"version\": 3}";
-      result_file.close();
-    }
 #endif
 
     if (capture_events) {
diff --git a/tools_webrtc/flags_compatibility.py b/tools_webrtc/flags_compatibility.py
deleted file mode 100644
index 9a3e5a1..0000000
--- a/tools_webrtc/flags_compatibility.py
+++ /dev/null
@@ -1,48 +0,0 @@
-#!/usr/bin/env python
-
-# Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
-#
-# Use of this source code is governed by a BSD-style license
-# that can be found in the LICENSE file in the root of the source
-# tree. An additional intellectual property rights grant can be found
-# in the file PATENTS.  All contributing project authors may
-# be found in the AUTHORS file in the root of the source tree.
-
-import argparse
-import logging
-import subprocess
-import sys
-
-
-def main():
-  parser = argparse.ArgumentParser()
-  parser.add_argument('--isolated-script-test-output')
-  parser.add_argument('--isolated-script-test-perf-output')
-  args, unrecognized_args = parser.parse_known_args()
-
-  test_command = _ForcePythonInterpreter(unrecognized_args)
-  if args.isolated_script_test_output:
-    test_command += ['--isolated_script_test_output',
-                     args.isolated_script_test_output]
-  if args.isolated_script_test_perf_output:
-    test_command += ['--isolated_script_test_perf_output',
-                     args.isolated_script_test_perf_output]
-  logging.info('Running %r', test_command)
-
-  return subprocess.call(test_command)
-
-
-def _ForcePythonInterpreter(cmd):
-  """Returns the fixed command line to call the right python executable."""
-  out = cmd[:]
-  if out[0] == 'python':
-    out[0] = sys.executable
-  elif out[0].endswith('.py'):
-    out.insert(0, sys.executable)
-  return out
-
-
-if __name__ == '__main__':
-  # pylint: disable=W0101
-  logging.basicConfig(level=logging.INFO)
-  sys.exit(main())
diff --git a/tools_webrtc/gtest-parallel-wrapper.py b/tools_webrtc/gtest-parallel-wrapper.py
index b4b6675..ec3b8b4 100755
--- a/tools_webrtc/gtest-parallel-wrapper.py
+++ b/tools_webrtc/gtest-parallel-wrapper.py
@@ -15,9 +15,8 @@
 flags. Developers should execute gtest-parallel directly.
 
 In particular, this translates the GTEST_SHARD_INDEX and GTEST_TOTAL_SHARDS
-environment variables to the --shard_index and --shard_count flags, renames
-the --isolated-script-test-output flag to --dump_json_test_results,
-and interprets e.g. --workers=2x as 2 workers per core.
+environment variables to the --shard_index and --shard_count flags, and
+interprets e.g. --workers=2x as 2 workers per core.
 
 Flags before '--' will be attempted to be understood as arguments to
 gtest-parallel. If gtest-parallel doesn't recognize the flag or the flag is
@@ -38,8 +37,6 @@
       --another_flag \
       --output_dir=SOME_OUTPUT_DIR \
       --store-test-artifacts
-      --isolated-script-test-output=SOME_DIR \
-      --isolated-script-test-perf-output=SOME_OTHER_DIR \
       -- \
       --foo=bar \
       --baz
@@ -50,13 +47,11 @@
       --shard_index 0 \
       --shard_count 1 \
       --output_dir=SOME_OUTPUT_DIR \
-      --dump_json_test_results=SOME_DIR \
       some_test \
       -- \
       --test_artifacts_dir=SOME_OUTPUT_DIR/test_artifacts \
       --some_flag=some_value \
       --another_flag \
-      --isolated-script-test-perf-output=SOME_OTHER_DIR \
       --foo=bar \
       --baz
 
@@ -137,12 +132,6 @@
   # Syntax 'Nx' will be interpreted as N * number of cpu cores.
   gtest_group.AddArgument('-w', '--workers', type=_ParseWorkersOption)
 
-  # --isolated-script-test-output is used to upload results to the flakiness
-  # dashboard. This translation is made because gtest-parallel expects the flag
-  # to be called --dump_json_test_results instead.
-  gtest_group.AddArgument('--isolated-script-test-output',
-                          dest='dump_json_test_results')
-
   # Needed when the test wants to store test artifacts, because it doesn't know
   # what will be the swarming output dir.
   parser.add_argument('--store-test-artifacts', action='store_true')
@@ -157,20 +146,8 @@
 
   options, unrecognized_args = parser.parse_known_args(argv)
 
-  webrtc_flags_to_change = {
-    '--isolated-script-test-perf-output': '--isolated_script_test_perf_output',
-    '--isolated-script-test-output': '--isolated_script_test_output',
-  }
-  args_to_pass = []
-  for arg in unrecognized_args:
-    if any(arg.startswith(k) for k in webrtc_flags_to_change.keys()):
-      arg_split = arg.split('=')
-      args_to_pass.append(
-        webrtc_flags_to_change[arg_split[0]] + '=' + arg_split[1])
-    else:
-      args_to_pass.append(arg)
-
-  executable_args = options.executable_args + args_to_pass
+  # Just pass on flags we don't recognize to the test binary.
+  executable_args = options.executable_args + unrecognized_args
 
   if options.store_test_artifacts:
     assert options.output_dir, (
diff --git a/tools_webrtc/gtest_parallel_wrapper_test.py b/tools_webrtc/gtest_parallel_wrapper_test.py
index 5d436aa..60c496c 100755
--- a/tools_webrtc/gtest_parallel_wrapper_test.py
+++ b/tools_webrtc/gtest_parallel_wrapper_test.py
@@ -110,12 +110,6 @@
     self.assertEqual(result.output_dir, '/tmp/foo')
     self.assertEqual(result.test_artifacts_dir, None)
 
-  def testJsonTestResults(self):
-    result = gtest_parallel_wrapper.ParseArgs(
-        ['--isolated-script-test-output', '/tmp/foo', 'exec'])
-    expected = self._Expected(['--dump_json_test_results=/tmp/foo', 'exec'])
-    self.assertEqual(result.gtest_parallel_args, expected)
-
   def testShortArg(self):
     result = gtest_parallel_wrapper.ParseArgs(['-d', '/tmp/foo', 'exec'])
     expected = self._Expected(['--output_dir=/tmp/foo', 'exec'])
@@ -139,13 +133,12 @@
       result = gtest_parallel_wrapper.ParseArgs([
           'some_test', '--some_flag=some_value', '--another_flag',
           '--output_dir=' + output_dir, '--store-test-artifacts',
-          '--isolated-script-test-output=SOME_DIR',
-          '--isolated-script-test-perf-output=SOME_OTHER_DIR', '--foo=bar',
+          '--isolated_script_test_perf_output=SOME_OTHER_DIR', '--foo=bar',
           '--baz'
       ])
       expected_artifacts_dir = os.path.join(output_dir, 'test_artifacts')
       expected = self._Expected([
-          '--output_dir=' + output_dir, '--dump_json_test_results=SOME_DIR',
+          '--output_dir=' + output_dir,
           'some_test', '--', '--test_artifacts_dir=' + expected_artifacts_dir,
           '--some_flag=some_value', '--another_flag',
           '--isolated_script_test_perf_output=SOME_OTHER_DIR', '--foo=bar',
diff --git a/tools_webrtc/mb/mb.py b/tools_webrtc/mb/mb.py
index 6287ca2..f332a46 100755
--- a/tools_webrtc/mb/mb.py
+++ b/tools_webrtc/mb/mb.py
@@ -855,10 +855,6 @@
                   '--logcat-output-file', '${ISOLATED_OUTDIR}/logcats',
                   '--store-tombstones']
     else:
-      if test_type == 'raw':
-        cmdline.append('../../tools_webrtc/flags_compatibility.py')
-        extra_files.append('../../tools_webrtc/flags_compatibility.py')
-
       if isolate_map[target].get('use_webcam', False):
         cmdline.append('../../tools_webrtc/ensure_webcam_is_running.py')
         extra_files.append('../../tools_webrtc/ensure_webcam_is_running.py')
diff --git a/tools_webrtc/mb/mb_unittest.py b/tools_webrtc/mb/mb_unittest.py
index c1e477c..7633dfe 100755
--- a/tools_webrtc/mb/mb_unittest.py
+++ b/tools_webrtc/mb/mb_unittest.py
@@ -453,11 +453,9 @@
     self.assertEqual(files, [
         '../../.vpython',
         '../../testing/test_env.py',
-        '../../tools_webrtc/flags_compatibility.py',
         'base_unittests',
     ])
     self.assertEqual(command, [
-        '../../tools_webrtc/flags_compatibility.py',
         '../../testing/test_env.py',
         './base_unittests',
         '--asan=0',