Move Singleton and related structs to namespace base

ios/chrome/browser/translate/translate_accept_languages_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 "ios/chrome/browser/translate/translate_accept_languages_factory.h"
 
 #include "base/prefs/pref_service.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/keyed_service/ios/browser_state_dependency_manager.h"
 #include "components/translate/core/browser/translate_accept_languages.h"
@@ skipping 27 matching lines @@
 }
 
 TranslateAcceptLanguagesService::~TranslateAcceptLanguagesService() {
 }
 
 }  // namespace
 
 // static
 TranslateAcceptLanguagesFactory*
 TranslateAcceptLanguagesFactory::GetInstance() {
-  return Singleton<TranslateAcceptLanguagesFactory>::get();
+  return base::Singleton<TranslateAcceptLanguagesFactory>::get();
 }
 
 // static
 translate::TranslateAcceptLanguages*
 TranslateAcceptLanguagesFactory::GetForBrowserState(
     ios::ChromeBrowserState* state) {
   TranslateAcceptLanguagesService* service =
       static_cast<TranslateAcceptLanguagesService*>(
           GetInstance()->GetServiceForBrowserState(state, true));
   return &service->accept_languages();
@@ skipping 14 matching lines @@
   ios::ChromeBrowserState* browser_state =
       ios::ChromeBrowserState::FromBrowserState(context);
   return make_scoped_ptr(
       new TranslateAcceptLanguagesService(browser_state->GetPrefs()));
 }
 
 web::BrowserState* TranslateAcceptLanguagesFactory::GetBrowserStateToUse(
     web::BrowserState* context) const {
   return GetBrowserStateRedirectedInIncognito(context);
 }