diff --git a/system_wrappers/BUILD.gn b/system_wrappers/BUILD.gn
index 0f5dc140db..b3e09f8b57 100644
--- a/system_wrappers/BUILD.gn
+++ b/system_wrappers/BUILD.gn
@@ -105,6 +105,16 @@ rtc_source_set("field_trial") {
   if (rtc_exclude_field_trial_default) {
     defines = [ "WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT" ]
   }
+  if (build_with_chromium) {
+    # When WebRTC is built as part of Chromium it should exclude the default
+    # implementation of field_trial unless it is building for NACL or
+    # Chromecast.
+    if (!is_nacl && !is_chromecast) {
+      deps = [
+        "../../webrtc_overrides:field_trial",
+      ]
+    }
+  }
 }
 
 rtc_source_set("metrics") {
@@ -123,6 +133,9 @@ rtc_source_set("metrics") {
     "../rtc_base:checks",
     "../rtc_base:rtc_base_approved",
   ]
+  if (build_with_chromium) {
+    deps += [ "../../webrtc_overrides:metrics" ]
+  }
 }
 
 if (is_android && !build_with_mozilla) {