chrome: Cleanup class/struct forward declarations

chrome/browser/ui/ash/multi_user/multi_user_window_manager.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_UI_ASH_MULTI_USER_MULTI_USER_WINDOW_MANAGER_H_
 #define CHROME_BROWSER_UI_ASH_MULTI_USER_MULTI_USER_WINDOW_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 class AccountId;
-class Browser;
 
 namespace content {
 class BrowserContext;
 }
 
 namespace aura {
 class Window;
 }
 
 namespace chrome {
 
-class MultiUserWindowManagerChromeOS;
-
 // The MultiUserWindowManager manages windows from multiple users by presenting
 // only user relevant windows to the current user. The manager is automatically
 // determining the window ownership from browser and application windows and
 // puts them onto the correct "desktop".
 // Un-owned windows will be visible on all users desktop's and owned windows can
 // only be presented on one desktop. If a window should get moved to another
 // user's desktop |ShowWindowForUser| can be called.
 // Windows which are neither a browser nor an app can be associated with a user
 // through |SetWindowOwner|.
 // This class will also switch the desktop upon user change.
@@ skipping 110 matching lines @@
   virtual ~MultiUserWindowManager() {}
 
  private:
   // Caching the current multi profile mode since the detection is expensive.
   static MultiProfileMode multi_user_mode_;
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_ASH_MULTI_USER_MULTI_USER_WINDOW_MANAGER_H_