Move Singleton and related structs to namespace base

chrome/browser/extensions/window_controller_list.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/extensions/window_controller_list.h"
 
 #include <algorithm>
 
 #include "chrome/browser/extensions/api/tabs/windows_util.h"
 #include "chrome/browser/extensions/chrome_extension_function_details.h"
 #include "chrome/browser/extensions/window_controller_list_observer.h"
 #include "chrome/common/extensions/api/windows.h"
 #include "components/sessions/session_id.h"
 #include "extensions/browser/extension_function.h"
 #include "ui/base/base_window.h"
 
 namespace extensions {
 
 ///////////////////////////////////////////////////////////////////////////////
 // WindowControllerList
 
 // static
 WindowControllerList* WindowControllerList::GetInstance() {
-  return Singleton<WindowControllerList>::get();
+  return base::Singleton<WindowControllerList>::get();
 }
 
 WindowControllerList::WindowControllerList() {
 }
 
 WindowControllerList::~WindowControllerList() {
 }
 
 void WindowControllerList::AddExtensionWindow(WindowController* window) {
   windows_.push_back(window);
@@ skipping 66 matching lines @@
     if (windows_util::CanOperateOnWindow(function, *iter, filter)) {
       result = *iter;
       if (result->window()->IsActive())
         break;  // use focused window
     }
   }
   return result;
 }
 
 }  // namespace extensions