Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

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/file_util.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/extension_test_message_listener.h"
 #include "chrome/browser/media_galleries/media_galleries_test_util.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "content/public/browser/render_view_host.h"
+#include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.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";
 
 #if !defined(OS_CHROMEOS)
@@ skipping 396 matching lines @@
   // Gallery watchers does not exists.
   // chrome.mediaGalleriesPrivate.getAllGalleryWatch should return an empty
   // list.
   ExtensionTestMessageListener get_all_gallery_watch_finished(
       kGetAllGalleryWatchResultA, false  /* no reply */);
   ExecuteCmdAndCheckReply(host, kGetAllWatchedGalleryIdsCmd,
                           kGetAllGalleryWatchOK);
   EXPECT_TRUE(get_all_gallery_watch_finished.WaitUntilSatisfied());
 }
 #endif