Move Singleton and related structs to namespace base

chrome/browser/chromeos/login/signin/token_handle_fetcher.cc

 // Copyright 2015 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/chromeos/login/signin/token_handle_fetcher.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "chrome/browser/chromeos/login/signin/token_handle_util.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "components/keyed_service/content/browser_context_keyed_service_shutdown_notifier_factory.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "google_apis/gaia/gaia_constants.h"
 
 namespace {
 const int kMaxRetries = 3;
 
 class ShutdownNotifierFactory
     : public BrowserContextKeyedServiceShutdownNotifierFactory {
  public:
   static ShutdownNotifierFactory* GetInstance() {
-    return Singleton<ShutdownNotifierFactory>::get();
+    return base::Singleton<ShutdownNotifierFactory>::get();
   }
 
  private:
-  friend struct DefaultSingletonTraits<ShutdownNotifierFactory>;
+  friend struct base::DefaultSingletonTraits<ShutdownNotifierFactory>;
 
   ShutdownNotifierFactory()
       : BrowserContextKeyedServiceShutdownNotifierFactory(
             "TokenHandleFetcher") {
     DependsOn(ProfileOAuth2TokenServiceFactory::GetInstance());
   }
   ~ShutdownNotifierFactory() override {}
 
   DISALLOW_COPY_AND_ASSIGN(ShutdownNotifierFactory);
 };
@@ skipping 107 matching lines @@
   }
   const base::TimeDelta duration =
       base::TimeTicks::Now() - tokeninfo_response_start_time_;
   UMA_HISTOGRAM_TIMES("Login.TokenObtainResponseTime", duration);
   callback_.Run(user_id_, success);
 }
 
 void TokenHandleFetcher::OnProfileDestroyed() {
   callback_.Run(user_id_, false);
 }