chrome: Cleanup class/struct forward declarations

chrome/browser/ui/website_settings/permission_prompt.h

 // Copyright 2014 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_PERMISSION_PROMPT_H_
 #define CHROME_BROWSER_UI_WEBSITE_SETTINGS_PERMISSION_PROMPT_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/callback.h"
 #include "ui/gfx/native_widget_types.h"
 
-class PermissionRequestManager;
 class PermissionRequest;
 
 namespace content {
 class WebContents;
 }
 
 // This class is the platform-independent interface through which the permission
 // request managers (which are one per tab) communicate to the UI surface.
 // When the visible tab changes, the UI code must provide an object of this type
 // to the manager for the visible tab.
@@ skipping 46 matching lines @@
 
   // Updates where the prompt should be anchored. ex: fullscreen toggle.
   virtual void UpdateAnchorPosition() = 0;
 
   // Returns a reference to this prompt's native window.
   // TODO(hcarmona): Remove this as part of the bubble API work.
   virtual gfx::NativeWindow GetNativeWindow() = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_WEBSITE_SETTINGS_PERMISSION_PROMPT_H_