Move Singleton and related structs to namespace base

chrome/browser/predictors/resource_prefetch_predictor_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 "chrome/browser/predictors/resource_prefetch_predictor_factory.h"
 
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/predictors/predictor_database_factory.h"
 #include "chrome/browser/predictors/resource_prefetch_common.h"
 #include "chrome/browser/predictors/resource_prefetch_predictor.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 namespace predictors {
 
 // static
 ResourcePrefetchPredictor* ResourcePrefetchPredictorFactory::GetForProfile(
     content::BrowserContext* context) {
   return static_cast<ResourcePrefetchPredictor*>(
       GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 // static
 ResourcePrefetchPredictorFactory*
 ResourcePrefetchPredictorFactory::GetInstance() {
-  return Singleton<ResourcePrefetchPredictorFactory>::get();
+  return base::Singleton<ResourcePrefetchPredictorFactory>::get();
 }
 
 ResourcePrefetchPredictorFactory::ResourcePrefetchPredictorFactory()
     : BrowserContextKeyedServiceFactory(
         "ResourcePrefetchPredictor",
         BrowserContextDependencyManager::GetInstance()) {
   DependsOn(HistoryServiceFactory::GetInstance());
   DependsOn(PredictorDatabaseFactory::GetInstance());
 }
 
 ResourcePrefetchPredictorFactory::~ResourcePrefetchPredictorFactory() {}
 
 KeyedService*
     ResourcePrefetchPredictorFactory::BuildServiceInstanceFor(
         content::BrowserContext* context) const {
   Profile* profile = Profile::FromBrowserContext(context);
 
   ResourcePrefetchPredictorConfig config;
   if (!IsSpeculativeResourcePrefetchingEnabled(profile, &config))
     return NULL;
 
   return new ResourcePrefetchPredictor(config, profile);
 }
 
 }  // namespace predictors