Move enable_webrtc to a buildflag header.

chrome/test/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
 import("//chrome/chrome_repack_locales.gni")
 import("//chrome/test/base/js2gtest.gni")
 import("//components/os_crypt/features.gni")
 import("//components/spellcheck/spellcheck_build_features.gni")
 import("//extensions/features/features.gni")
+import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//remoting/remoting_enable.gni")
 import("//services/service_manager/public/service_manifest.gni")
 import("//testing/test.gni")
 import("//v8/gni/v8.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
@@ skipping 92 matching lines @@
     "//components/sync:test_support_driver",
     "//components/sync_preferences:test_support",
     "//components/sync_sessions:test_support",
     "//components/toolbar:test_support",
     "//components/update_client:test_support",
     "//components/zoom:test_support",
     "//content/public/app:both",
     "//content/test:test_support",
     "//extensions/features",
     "//gpu/ipc/service",
+    "//media:media_features",
     "//net",
     "//net:test_support",
     "//ppapi/features",
     "//printing/features",
     "//skia",
     "//sql",
     "//sql:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/zlib",
@@ skipping 1087 matching lines @@
   configs += [ "//build/config:precompiled_headers" ]
 
   deps = [
     ":browser_tests_runner",
     ":repack_pseudo_locales",
     ":test_support",
     "//base",
     "//components/spellcheck:build_features",
     "//components/sync:test_support_model",
     "//extensions/features",
+    "//media:media_features",
     "//ppapi/features",
     "//printing/features",
     "//third_party/WebKit/public:features",
   ]
 
   data_deps = [
     "//testing/buildbot/filters:browser_tests_filters",
   ]
 
   data = []
@@ skipping 2207 matching lines @@
     "//chrome:resources",
     "//chrome:strings",
     "//components/component_updater:test_support",
     "//components/safe_browsing_db:test_database_manager",
     "//components/spellcheck:build_features",
     "//components/subresource_filter/core/browser:test_support",
     "//components/version_info:generate_version_info",
     "//courgette:courgette_lib",
     "//extensions/features",
     "//google_apis",
+    "//media:media_features",
     "//ppapi/features",
     "//skia",
     "//third_party/cacheinvalidation",
     "//third_party/icu",
     "//third_party/libxml",
     "//ui/base:test_support",
     "//ui/display:test_support",
     "//ui/gfx:test_support",
     "//ui/resources",
   ]
@@ skipping 1628 matching lines @@
       "touch_hud",
       "ui",
     ]
 
     if (is_linux && !is_android) {
       deps += [ "//components/font_service:manifest" ]
       packaged_services += [ "font_service" ]
     }
   }
 }