Move Singleton and related structs to namespace base

chrome/browser/predictors/predictor_database_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/predictors/predictor_database_factory.h"
 
 #include "base/bind.h"
 #include "chrome/browser/predictors/predictor_database.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 namespace predictors {
 
 // static
 PredictorDatabase* PredictorDatabaseFactory::GetForProfile(Profile* profile) {
   return static_cast<PredictorDatabase*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 PredictorDatabaseFactory* PredictorDatabaseFactory::GetInstance() {
-  return Singleton<PredictorDatabaseFactory>::get();
+  return base::Singleton<PredictorDatabaseFactory>::get();
 }
 
 PredictorDatabaseFactory::PredictorDatabaseFactory()
     : BrowserContextKeyedServiceFactory(
         "PredictorDatabase", BrowserContextDependencyManager::GetInstance()) {
 }
 
 PredictorDatabaseFactory::~PredictorDatabaseFactory() {
 }
 
 KeyedService* PredictorDatabaseFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return new PredictorDatabase(static_cast<Profile*>(profile));
 }
 
 }  // namespace predictors