Move Singleton and related structs to namespace base

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

 // Copyright 2014 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/auth_sync_observer_factory.h"
 
 #include "chrome/browser/chromeos/login/signin/auth_sync_observer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
@@ skipping 13 matching lines @@
 // static
 AuthSyncObserver* AuthSyncObserverFactory::GetForProfile(
     Profile* profile) {
   return static_cast<AuthSyncObserver*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 AuthSyncObserverFactory*
     AuthSyncObserverFactory::GetInstance() {
-  return Singleton<AuthSyncObserverFactory>::get();
+  return base::Singleton<AuthSyncObserverFactory>::get();
 }
 
 KeyedService* AuthSyncObserverFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   Profile* profile = static_cast<Profile*>(context);
   return new AuthSyncObserver(profile);
 }
 
 }  // namespace chromeos