Move Singleton and related structs to namespace base

chrome/browser/extensions/api/proxy/proxy_api.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.
 
 // Implementation of the Chrome Extensions Proxy Settings API.
 
 #include "chrome/browser/extensions/api/proxy/proxy_api.h"
 
 #include "base/json/json_writer.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/proxy/proxy_api_constants.h"
 #include "chrome/browser/extensions/api/proxy/proxy_api_helpers.h"
 #include "chrome/browser/extensions/event_router_forwarder.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "components/proxy_config/proxy_config_dictionary.h"
 #include "net/base/net_errors.h"
 
 namespace extensions {
 
 namespace helpers = proxy_api_helpers;
 namespace keys = proxy_api_constants;
 
 // static
 ProxyEventRouter* ProxyEventRouter::GetInstance() {
-  return Singleton<ProxyEventRouter>::get();
+  return base::Singleton<ProxyEventRouter>::get();
 }
 
 ProxyEventRouter::ProxyEventRouter() {
 }
 
 ProxyEventRouter::~ProxyEventRouter() {
 }
 
 void ProxyEventRouter::OnProxyError(
     EventRouterForwarder* event_router,
@@ skipping 143 matching lines @@
       extension_pref->Set(keys::kProxyConfigRules, proxy_rules_dict);
       break;
     }
     case ProxyPrefs::kModeCount:
       NOTREACHED();
   }
   return extension_pref.release();
 }
 
 }  // namespace extensions