chrome: Cleanup class/struct forward declarations

chrome/browser/ui/autofill/popup_controller_common.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_AUTOFILL_POPUP_CONTROLLER_COMMON_H_
 #define CHROME_BROWSER_UI_AUTOFILL_POPUP_CONTROLLER_COMMON_H_
 
 #include "base/i18n/rtl.h"
 #include "base/macros.h"
 #include "content/public/browser/render_widget_host.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace content {
-struct NativeWebKeyboardEvent;
 class RenderViewHost;
 class WebContents;
 }
 
 namespace autofill {
 
 // Class that controls common functionality for  Autofill style popups. Can
 // determine the correct location of a popup of a desired size and can register
 // a handler to key press events.
 class PopupControllerCommon {
@@ skipping 45 matching lines @@
   content::RenderViewHost* key_press_event_target_;
 
   content::RenderWidgetHost::KeyPressEventCallback key_press_event_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(PopupControllerCommon);
 };
 
 }  // namespace autofill
 
 #endif  // CHROME_BROWSER_UI_AUTOFILL_POPUP_CONTROLLER_COMMON_H_