Cleanup: Remove unneeded forward declarations from chrome/browser/chromeos.

chrome/browser/chromeos/frame/panel_controller.h

 // Copyright (c) 2011 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_CHROMEOS_FRAME_PANEL_CONTROLLER_H_
 #define CHROME_BROWSER_CHROMEOS_FRAME_PANEL_CONTROLLER_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
 #include "third_party/cros_system_api/window_manager/chromeos_wm_ipc_enums.h"
 #include "ui/base/x/x11_util.h"
 #include "views/controls/button/button.h"
 
-class BrowserView;
 class SkBitmap;
 typedef unsigned long XID;
 
 namespace base {
 class Time;
 }
 
 namespace views {
 class ImageButton;
 class ImageView;
@@ skipping 148 matching lines @@
 
   // Timestamp to prevent setting urgent immediately after clearing it.
   base::TimeTicks urgent_cleared_time_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelController);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FRAME_PANEL_CONTROLLER_H_