Move extension_test_message_listener to extensions.

chrome/browser/extensions/api/media_galleries_private/media_galleries_watch_apitest.cc

 // Copyright (c) 2012 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.
 //
 // MediaGalleriesPrivate gallery watch API browser tests.
 
 #include "base/files/file_path.h"
 #include "base/files/file_path_watcher.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/extension_test_message_listener.h"
 #include "chrome/browser/media_galleries/media_file_system_registry.h"
 #include "chrome/browser/media_galleries/media_galleries_preferences.h"
 #include "chrome/browser/media_galleries/media_galleries_test_util.h"
 #include "chrome/common/chrome_paths.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/switches.h"
+#include "extensions/test/extension_test_message_listener.h"
 
 namespace {
 
 // Id of test extension from
 // chrome/test/data/extensions/api_test/|kTestExtensionPath|
 const char kTestExtensionId[] = "gceegfkgibmgpfopknlcgleimclbknie";
 const char kTestExtensionPath[] = "media_galleries_private/gallerywatch";
 
 // JS commands.
 const char kGetAllWatchedGalleryIdsCmd[] = "getAllWatchedGalleryIds()";
@@ skipping 300 matching lines @@
   // Remove all gallery watchers.
   ExecuteCmdAndCheckReply(kRemoveAllGalleryWatchCmd, kRemoveAllGalleryWatchOK);
 
   // Gallery watchers removed. chrome.mediaGalleriesPrivate.getAllGalleryWatch
   // should return an empty list.
   ExtensionTestMessageListener final_get_all_check_finished(
       kNoGalleryWatchesInstalled, false  /* no reply */);
   ExecuteCmdAndCheckReply(kGetAllWatchedGalleryIdsCmd, kGetAllGalleryWatchOK);
   EXPECT_TRUE(final_get_all_check_finished.WaitUntilSatisfied());
 }