Move Singleton and related structs to namespace base

chrome/browser/permissions/permission_manager_factory.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/permissions/permission_manager_factory.h"
 
 #include "chrome/browser/permissions/permission_context.h"
 #include "chrome/browser/permissions/permission_manager.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 // static
 PermissionManager*
 PermissionManagerFactory::GetForProfile(Profile* profile) {
   return static_cast<PermissionManager*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 PermissionManagerFactory* PermissionManagerFactory::GetInstance() {
-  return Singleton<PermissionManagerFactory>::get();
+  return base::Singleton<PermissionManagerFactory>::get();
 }
 
 PermissionManagerFactory::PermissionManagerFactory()
     : BrowserContextKeyedServiceFactory(
         "PermissionManagerFactory",
         BrowserContextDependencyManager::GetInstance()) {
   for (KeyedServiceBaseFactory* factory : PermissionContext::GetFactories())
     DependsOn(factory);
 }
 
 PermissionManagerFactory::~PermissionManagerFactory() {
 }
 
 KeyedService* PermissionManagerFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   return new PermissionManager(Profile::FromBrowserContext(context));
 }
 
 content::BrowserContext*
 PermissionManagerFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextOwnInstanceInIncognito(context);
 }