Do not build task_queue.cc and include from webrtc_overrides in Chrome.

webrtc/base/BUILD.gn

 # Copyright (c) 2014 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("//build/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 183 matching lines @@
 static_library("rtc_task_queue") {
   public_deps = [
     ":rtc_base_approved",
   ]
   configs += [ "..:common_config" ]
 
   sources = [
     "sequenced_task_checker.h",
     "sequenced_task_checker_impl.cc",
     "sequenced_task_checker_impl.h",
-    "task_queue.h",
-    "task_queue_posix.h",
   ]
 
-  if (rtc_build_libevent) {
-    deps = [
-      "//base/third_party/libevent",
+  if (build_with_chromium) {
+    sources += [
+      "../../webrtc_overrides/webrtc/base/task_queue.cc",
+      "../../webrtc_overrides/webrtc/base/task_queue.h",
     ]
-  }
+    include_dirs = [ "../../webrtc_overrides" ]
+  } else {
+    sources += [
+      "task_queue.h",
+      "task_queue_posix.h",
+    ]
+    if (rtc_build_libevent) {
+      deps = [
+        "//base/third_party/libevent",
+      ]
+    }
 
-  if (rtc_enable_libevent) {
-    sources += [
-      "task_queue_libevent.cc",
-      "task_queue_posix.cc",
-    ]
-    all_dependent_configs = [ ":enable_libevent_config" ]
-  } else {
-    if (is_mac || is_ios) {
+    if (rtc_enable_libevent) {
       sources += [
-        "task_queue_gcd.cc",
+        "task_queue_libevent.cc",
         "task_queue_posix.cc",
       ]
-    }
-    if (is_win) {
-      sources += [ "task_queue_win.cc" ]
+      all_dependent_configs = [ ":enable_libevent_config" ]
+    } else {
+      if (is_mac || is_ios) {
+        sources += [
+          "task_queue_gcd.cc",
+          "task_queue_posix.cc",
+        ]
+      }
+      if (is_win) {
+        sources += [ "task_queue_win.cc" ]
+      }
     }
   }
 }
 
 static_library("rtc_base") {
   cflags = []
   cflags_cc = []
   libs = []
   deps = [
     "..:webrtc_common",
@@ skipping 465 matching lines @@
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",
     ]
 
     deps = [
       "//base:base_java",
     ]
   }
 }