Move Singleton and related structs to namespace base

chrome/browser/extensions/extension_garbage_collector_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/extensions/extension_garbage_collector_factory.h"
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/extensions/extension_garbage_collector.h"
 #include "chrome/browser/extensions/extension_system_factory.h"
 #include "chrome/browser/extensions/install_tracker_factory.h"
@@ skipping 10 matching lines @@
 ExtensionGarbageCollector*
 ExtensionGarbageCollectorFactory::GetForBrowserContext(
     content::BrowserContext* context) {
   return static_cast<ExtensionGarbageCollector*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 // static
 ExtensionGarbageCollectorFactory*
 ExtensionGarbageCollectorFactory::GetInstance() {
-  return Singleton<ExtensionGarbageCollectorFactory>::get();
+  return base::Singleton<ExtensionGarbageCollectorFactory>::get();
 }
 
 ExtensionGarbageCollectorFactory::ExtensionGarbageCollectorFactory()
     : BrowserContextKeyedServiceFactory(
           "ExtensionGarbageCollector",
           BrowserContextDependencyManager::GetInstance()) {
   DependsOn(ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
   DependsOn(InstallTrackerFactory::GetInstance());
 }
 
@@ skipping 17 matching lines @@
 bool ExtensionGarbageCollectorFactory::ServiceIsCreatedWithBrowserContext()
     const {
   return true;
 }
 
 bool ExtensionGarbageCollectorFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }
 
 }  // namespace extensions