Move Singleton and related structs to namespace base

chrome/browser/predictors/autocomplete_action_predictor_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/autocomplete_action_predictor_factory.h"
 
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/predictors/autocomplete_action_predictor.h"
 #include "chrome/browser/predictors/predictor_database_factory.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 namespace predictors {
 
 // static
 AutocompleteActionPredictor* AutocompleteActionPredictorFactory::GetForProfile(
     Profile* profile) {
   return static_cast<AutocompleteActionPredictor*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 AutocompleteActionPredictorFactory*
     AutocompleteActionPredictorFactory::GetInstance() {
-  return Singleton<AutocompleteActionPredictorFactory>::get();
+  return base::Singleton<AutocompleteActionPredictorFactory>::get();
 }
 
 AutocompleteActionPredictorFactory::AutocompleteActionPredictorFactory()
     : BrowserContextKeyedServiceFactory(
         "AutocompleteActionPredictor",
         BrowserContextDependencyManager::GetInstance()) {
   DependsOn(HistoryServiceFactory::GetInstance());
   DependsOn(PredictorDatabaseFactory::GetInstance());
 }
 
 AutocompleteActionPredictorFactory::~AutocompleteActionPredictorFactory() {}
 
 content::BrowserContext*
 AutocompleteActionPredictorFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextOwnInstanceInIncognito(context);
 }
 
 KeyedService* AutocompleteActionPredictorFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return new AutocompleteActionPredictor(static_cast<Profile*>(profile));
 }
 
 }  // namespace predictors