Remove stale Android NDK [2/2]

Now that chromium/base has rolled and switched the android_ndk_root to
the new android_toolchain directory, remove the stale Android NDK. Also
update the license generation and build helper scripts to remove
references to the previous NDK.

Bug: chromium:1448383
Test: Verified build of WebRTC.
Change-Id: Ic2b6009f454d67da60231bbcbb5c27bde8407ef3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/307541
Commit-Queue: Prashanth Swaminathan <prashanthsw@google.com>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40246}

DEPS

diff --git a/DEPS b/DEPS
index 76726f4..d13f51f 100644
--- a/DEPS
+++ b/DEPS
@@ -397,11 +397,6 @@
       'dep_type': 'cipd',
   },
 
-  'src/third_party/android_ndk': {
-      'url': 'https://chromium.googlesource.com/android_ndk.git@310956bd122ec2b96049f8d7398de6b717f3452e',
-      'condition': 'checkout_android',
-  },
-
   'src/third_party/android_toolchain': {
     'packages': [
       {

tools_webrtc/libs/generate_licenses.py

diff --git a/tools_webrtc/libs/generate_licenses.py b/tools_webrtc/libs/generate_licenses.py
index efec015..835d988 100755
--- a/tools_webrtc/libs/generate_licenses.py
+++ b/tools_webrtc/libs/generate_licenses.py
@@ -34,7 +34,6 @@
 # (right after the `third_party/` prefix)
 LIB_TO_LICENSES_DICT = {
     'abseil-cpp': ['third_party/abseil-cpp/LICENSE'],
-    'android_ndk': ['third_party/android_ndk/NOTICE'],
     'android_sdk': ['third_party/android_sdk/LICENSE'],
     'android_toolchain': ['third_party/android_toolchain/NOTICE'],
     'auto': [

tools_webrtc/presubmit_checks_lib/build_helpers.py

diff --git a/tools_webrtc/presubmit_checks_lib/build_helpers.py b/tools_webrtc/presubmit_checks_lib/build_helpers.py
index 159160c..d64c2f4 100644
--- a/tools_webrtc/presubmit_checks_lib/build_helpers.py
+++ b/tools_webrtc/presubmit_checks_lib/build_helpers.py
@@ -80,8 +80,7 @@
 
 def GetClangTidyPath():
   """POC/WIP! Use the one we have, even it doesn't match clang's version."""
-  tidy = ('third_party/android_ndk/toolchains/'
-          'third_party/android_toolchain/toolchains/'
+  tidy = ('third_party/android_toolchain/toolchains/'
           'llvm/prebuilt/linux-x86_64/bin/clang-tidy')
   return os.path.join(SRC_DIR, tidy)