Move Singleton and related structs to namespace base

components/feedback/feedback_uploader_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/feedback/feedback_uploader_factory.h"
 
 #include "base/memory/singleton.h"
 #include "components/feedback/feedback_uploader.h"
 #include "components/feedback/feedback_uploader_chrome.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 namespace feedback {
 
 // static
 FeedbackUploaderFactory* FeedbackUploaderFactory::GetInstance() {
-  return Singleton<FeedbackUploaderFactory>::get();
+  return base::Singleton<FeedbackUploaderFactory>::get();
 }
 
 // static
 FeedbackUploader* FeedbackUploaderFactory::GetForBrowserContext(
     content::BrowserContext* context) {
   return static_cast<FeedbackUploaderChrome*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 FeedbackUploaderFactory::FeedbackUploaderFactory()
     : BrowserContextKeyedServiceFactory(
           "feedback::FeedbackUploader",
           BrowserContextDependencyManager::GetInstance()) {}
 
 FeedbackUploaderFactory::~FeedbackUploaderFactory() {}
 
 KeyedService* FeedbackUploaderFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   return new FeedbackUploaderChrome(context);
 }
 
 content::BrowserContext* FeedbackUploaderFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return context;
 }
 
 }  // namespace feedback