Move Singleton and related structs to namespace base

chrome/browser/prerender/prerender_message_filter.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_message_filter.h"
 
 #include "base/bind.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/prerender/prerender_link_manager.h"
 #include "chrome/browser/prerender/prerender_link_manager_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/prerender_messages.h"
 #include "components/keyed_service/content/browser_context_keyed_service_shutdown_notifier_factory.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
 
 namespace prerender {
 
 namespace {
 
 class ShutdownNotifierFactory
     : public BrowserContextKeyedServiceShutdownNotifierFactory {
  public:
   static ShutdownNotifierFactory* GetInstance() {
-    return Singleton<ShutdownNotifierFactory>::get();
+    return base::Singleton<ShutdownNotifierFactory>::get();
   }
 
  private:
-  friend struct DefaultSingletonTraits<ShutdownNotifierFactory>;
+  friend struct base::DefaultSingletonTraits<ShutdownNotifierFactory>;
 
   ShutdownNotifierFactory()
       : BrowserContextKeyedServiceShutdownNotifierFactory(
             "PrerenderMessageFilter") {
     DependsOn(PrerenderLinkManagerFactory::GetInstance());
   }
   ~ShutdownNotifierFactory() override {}
 
   DISALLOW_COPY_AND_ASSIGN(ShutdownNotifierFactory);
 };
@@ skipping 87 matching lines @@
 
 void PrerenderMessageFilter::OnChannelClosingInUIThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (!prerender_link_manager_)
     return;
   prerender_link_manager_->OnChannelClosing(render_process_id_);
 }
 
 }  // namespace prerender