Move Singleton and related structs to namespace base

chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings_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/net/spdyproxy/data_reduction_proxy_chrome_settings_factory.h"
 
 #include "base/bind.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
@@ skipping 10 matching lines @@
 // static
 bool
 DataReductionProxyChromeSettingsFactory::HasDataReductionProxyChromeSettings(
     content::BrowserContext* context) {
   return GetInstance()->GetServiceForBrowserContext(context, false) != NULL;
 }
 
 // static
 DataReductionProxyChromeSettingsFactory*
 DataReductionProxyChromeSettingsFactory::GetInstance() {
-  return Singleton<DataReductionProxyChromeSettingsFactory>::get();
+  return base::Singleton<DataReductionProxyChromeSettingsFactory>::get();
 }
 
 
 DataReductionProxyChromeSettingsFactory::
     DataReductionProxyChromeSettingsFactory()
     : BrowserContextKeyedServiceFactory(
         "DataReductionProxyChromeSettings",
         BrowserContextDependencyManager::GetInstance()) {
 }
 
 DataReductionProxyChromeSettingsFactory::
     ~DataReductionProxyChromeSettingsFactory() {
 }
 
 KeyedService* DataReductionProxyChromeSettingsFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   return new DataReductionProxyChromeSettings();
 }