Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/services/gcm/gcm_profile_service.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/browser/services/gcm/gcm_profile_service.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/state_store.h"
 #include "chrome/browser/services/gcm/gcm_client_factory.h"
 #include "chrome/browser/services/gcm/gcm_event_router.h"
 #include "chrome/browser/signin/signin_manager.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/pref_names.h"
 #include "components/user_prefs/pref_registry_syncable.h"
 #include "components/webdata/encryptor/encryptor.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
+#include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.h"
 
 using extensions::Extension;
 
 namespace gcm {
 
 const char kRegistrationKey[] = "gcm.registration";
 const char kSendersKey[] = "senders";
 const char kRegistrationIDKey[] = "reg_id";
 
@@ skipping 983 matching lines @@
 
   return true;
 }
 
 // static
 const char* GCMProfileService::GetPersistentRegisterKeyForTesting() {
   return kRegistrationKey;
 }
 
 }  // namespace gcm