Use TaskScheduler instead of WorkerPool in v8_platform.cc.

extensions/renderer/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//extensions/features/features.gni")
 
 assert(enable_extensions)
 
 source_set("renderer") {
@@ skipping 295 matching lines @@
     "string_source_map.cc",
     "string_source_map.h",
     "test_v8_extension_configuration.cc",
     "test_v8_extension_configuration.h",
     "utils_unittest.cc",
   ]
 
   deps = [
     ":renderer",
     "//base",
+    "//base/test:test_support",
     "//components/crx_file:crx_file",
     "//content/public/child",
     "//extensions:extensions_renderer_resources",
     "//extensions:test_support",
     "//gin:gin_test",
 
     # TODO(brettw) these tests should not be including headers from browser.
     "//extensions/browser",
     "//extensions/common",
     "//gin",
     "//mojo/edk/js",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/WebKit/public:blink",
     "//ui/base",
   ]
 
   if (enable_wifi_display && proprietary_codecs) {
     sources += [
       "api/display_source/wifi_display/wifi_display_elementary_stream_descriptor_unittest.cc",
       "api/display_source/wifi_display/wifi_display_media_packetizer_unittest.cc",
     ]
   }
 }