diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index 28ff7fd..32ef93e 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -407,6 +407,10 @@
     ":stringutils",
     "system:rtc_export",
   ]
+  if (rtc_exclude_system_time) {
+    defines = [ "WEBRTC_EXCLUDE_SYSTEM_TIME" ]
+  }
+
   libs = []
   if (is_win) {
     libs += [ "winmm.lib" ]
diff --git a/rtc_base/system_time.cc b/rtc_base/system_time.cc
index bcd4e6c..9efe76e 100644
--- a/rtc_base/system_time.cc
+++ b/rtc_base/system_time.cc
@@ -8,6 +8,10 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+// If WEBRTC_EXCLUDE_SYSTEM_TIME is set, an implementation of
+// rtc::SystemTimeNanos() must be provided externally.
+#ifndef WEBRTC_EXCLUDE_SYSTEM_TIME
+
 #include <stdint.h>
 
 #include <limits>
@@ -90,3 +94,4 @@
 }
 
 }  // namespace rtc
+#endif  // WEBRTC_EXCLUDE_SYSTEM_TIME
diff --git a/rtc_tools/BUILD.gn b/rtc_tools/BUILD.gn
index f6352d8..2020957 100644
--- a/rtc_tools/BUILD.gn
+++ b/rtc_tools/BUILD.gn
@@ -136,6 +136,12 @@
     "//third_party/abseil-cpp/absl/flags:parse",
     "//third_party/abseil-cpp/absl/strings",
   ]
+
+  if (build_with_chromium) {
+    # When building from Chromium, WebRTC's metrics and field trial
+    # implementations need to be replaced by the Chromium ones.
+    deps += [ "//third_party/webrtc_overrides:webrtc_component" ]
+  }
 }
 
 # TODO(bugs.webrtc.org/11474): Enable this on win if needed. For now it
diff --git a/test/fuzzers/BUILD.gn b/test/fuzzers/BUILD.gn
index af7a4b7..44387ad 100644
--- a/test/fuzzers/BUILD.gn
+++ b/test/fuzzers/BUILD.gn
@@ -18,11 +18,12 @@
   ]
 
   # When WebRTC fuzzer tests are built on Chromium bots they need to link
-  # with Chromium's implementation of metrics and field trial.
+  # with Chromium's implementation of metrics, field trial, and system time.
   if (build_with_chromium) {
     deps += [
       "../../../webrtc_overrides:field_trial",
       "../../../webrtc_overrides:metrics",
+      "../../../webrtc_overrides:system_time",
     ]
   }
 }
diff --git a/webrtc.gni b/webrtc.gni
index 08b2d66..c1227ba 100644
--- a/webrtc.gni
+++ b/webrtc.gni
@@ -63,7 +63,7 @@
   # will tell the pre-processor to remove the default definition of the
   # SystemTimeNanos() which is defined in rtc_base/system_time.cc. In
   # that case a new implementation needs to be provided.
-  rtc_exclude_system_time = false
+  rtc_exclude_system_time = build_with_chromium
 
   # Setting this to false will require the API user to pass in their own
   # SSLCertificateVerifier to verify the certificates presented from a