Move Singleton and related structs to namespace base

extensions/browser/process_manager_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 "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "extensions/browser/extension_registry_factory.h"
 #include "extensions/browser/process_manager.h"
 #include "extensions/browser/process_manager_factory.h"
 
 using content::BrowserContext;
 
 namespace extensions {
 
 // static
 ProcessManager* ProcessManagerFactory::GetForBrowserContext(
     BrowserContext* context) {
   return static_cast<ProcessManager*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 // static
 ProcessManager* ProcessManagerFactory::GetForBrowserContextIfExists(
     BrowserContext* context) {
   return static_cast<ProcessManager*>(
       GetInstance()->GetServiceForBrowserContext(context, false));
 }
 
 // static
 ProcessManagerFactory* ProcessManagerFactory::GetInstance() {
-  return Singleton<ProcessManagerFactory>::get();
+  return base::Singleton<ProcessManagerFactory>::get();
 }
 
 ProcessManagerFactory::ProcessManagerFactory()
     : BrowserContextKeyedServiceFactory(
           "ProcessManager",
           BrowserContextDependencyManager::GetInstance()) {
   DependsOn(extensions::ExtensionRegistryFactory::GetInstance());
 }
 
 ProcessManagerFactory::~ProcessManagerFactory() {
 }
 
 KeyedService* ProcessManagerFactory::BuildServiceInstanceFor(
     BrowserContext* context) const {
   return ProcessManager::Create(context);
 }
 
 BrowserContext* ProcessManagerFactory::GetBrowserContextToUse(
     BrowserContext* context) const {
   // ProcessManager::Create handles guest and incognito profiles, returning an
   // IncognitoProcessManager in incognito mode.
   return context;
 }
 
 }  // namespace extensions