chrome: Cleanup class/struct forward declarations

chrome/browser/ui/views/website_settings/permission_selector_row_observer.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_WEBSITE_SETTINGS_PERMISSION_SELECTOR_ROW_OBSERVER_H_
 #define CHROME_BROWSER_UI_VIEWS_WEBSITE_SETTINGS_PERMISSION_SELECTOR_ROW_OBSERVER_H_
 
 #include "chrome/browser/ui/website_settings/website_settings_ui.h"
 
-class PermissionSelectorRow;
-
 class PermissionSelectorRowObserver {
  public:
   // This method is called whenever the permission setting is changed.
   virtual void OnPermissionChanged(
       const WebsiteSettingsUI::PermissionInfo& permission) = 0;
 
  protected:
   virtual ~PermissionSelectorRowObserver() {}
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_WEBSITE_SETTINGS_PERMISSION_SELECTOR_ROW_OBSERVER_H_