chrome: Cleanup class/struct forward declarations

chrome/browser/ui/website_settings/mock_permission_prompt_factory.h

 // Copyright 2016 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_WEBSITE_SETTINGS_MOCK_PERMISSION_PROMPT_FACTORY_H_
 #define CHROME_BROWSER_UI_WEBSITE_SETTINGS_MOCK_PERMISSION_PROMPT_FACTORY_H_
 
 #include <memory>
 #include <vector>
 
 #include "chrome/browser/permissions/permission_request_manager.h"
 
-class Browser;
 class MockPermissionPrompt;
 class PermissionPrompt;
 
 namespace content {
 class WebContents;
 }
 
 // Provides a skeleton class for both unit and browser testing when trying to
 // test the bubble manager logic. Should not be used for anything that requires
 // actual UI.
@@ skipping 53 matching lines @@
 
   base::Closure show_bubble_quit_closure_;
 
   // The bubble manager that will be associated with this factory.
   PermissionRequestManager* manager_;
 
   DISALLOW_COPY_AND_ASSIGN(MockPermissionPromptFactory);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBSITE_SETTINGS_MOCK_PERMISSION_PROMPT_FACTORY_H_