Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/extensions/api/identity/account_tracker.cc

 // Copyright 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/extensions/api/identity/account_tracker.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/profile_oauth2_token_service.h"
 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
 #include "chrome/browser/signin/signin_manager_base.h"
 #include "content/public/browser/notification_details.h"
+#include "extensions/browser/extension_system.h"
 
 namespace extensions {
 
 AccountTracker::AccountTracker(Profile* profile) : profile_(profile) {
   registrar_.Add(this,
                  chrome::NOTIFICATION_GOOGLE_SIGNED_OUT,
                  content::Source<Profile>(profile_));
 
   ProfileOAuth2TokenServiceFactory::GetForProfile(profile_)->AddObserver(this);
   SigninGlobalError::GetForProfile(profile_)->AddProvider(this);
@@ skipping 220 matching lines @@
   LOG(ERROR) << "OnOAuthError";
   tracker_->OnUserInfoFetchFailure(this);
 }
 
 void AccountIdFetcher::OnNetworkError(int response_code) {
   LOG(ERROR) << "OnNetworkError " << response_code;
   tracker_->OnUserInfoFetchFailure(this);
 }
 
 }  // namespace extensions