Move Singleton and related structs to namespace base

chrome/browser/android/offline_pages/offline_page_model_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/android/offline_pages/offline_page_model_factory.h"
 
 #include "base/files/file_path.h"
 #include "base/memory/singleton.h"
 #include "base/path_service.h"
 #include "base/sequenced_task_runner.h"
@@ skipping 10 matching lines @@
 namespace offline_pages {
 
 OfflinePageModelFactory::OfflinePageModelFactory()
     : BrowserContextKeyedServiceFactory(
           "OfflinePageModel",
           BrowserContextDependencyManager::GetInstance()) {
 }
 
 // static
 OfflinePageModelFactory* OfflinePageModelFactory::GetInstance() {
-  return Singleton<OfflinePageModelFactory>::get();
+  return base::Singleton<OfflinePageModelFactory>::get();
 }
 
 // static
 OfflinePageModel* OfflinePageModelFactory::GetForBrowserContext(
     content::BrowserContext* context) {
   if (context->IsOffTheRecord())
     return nullptr;
 
   return static_cast<OfflinePageModel*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
@@ skipping 19 matching lines @@
   return new OfflinePageModel(metadata_store.Pass(), background_task_runner);
 }
 
 content::BrowserContext* OfflinePageModelFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 }  // namespace offline_pages