Move Singleton and related structs to namespace base

chrome/browser/prerender/prerender_manager_factory.cc

 // Copyright (c) 2012 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/prerender/prerender_manager_factory.h"
 
 #include "base/sys_info.h"
 #include "base/trace_event/trace_event.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/history/history_service_factory.h"
@@ skipping 16 matching lines @@
     Profile* profile) {
   TRACE_EVENT0("browser", "PrerenderManagerFactory::GetForProfile")
   if (!PrerenderManager::IsPrerenderingPossible())
     return NULL;
   return static_cast<PrerenderManager*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 PrerenderManagerFactory* PrerenderManagerFactory::GetInstance() {
-  return Singleton<PrerenderManagerFactory>::get();
+  return base::Singleton<PrerenderManagerFactory>::get();
 }
 
 PrerenderManagerFactory::PrerenderManagerFactory()
     : BrowserContextKeyedServiceFactory(
         "PrerenderManager",
         BrowserContextDependencyManager::GetInstance()) {
 #if defined(ENABLE_EXTENSIONS)
   DependsOn(
       extensions::ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
 #endif
@@ skipping 14 matching lines @@
 
   return new PrerenderManager(profile);
 }
 
 content::BrowserContext* PrerenderManagerFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextOwnInstanceInIncognito(context);
 }
 
 }  // namespace prerender