Remove duplicated headers from core/

Source/core/page/DragController.cpp

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 36 matching lines @@
 #include "core/fetch/ImageResource.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/frame/Frame.h"
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLAnchorElement.h"
 #include "core/html/HTMLFormElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLPlugInElement.h"
 #include "core/loader/FrameLoadRequest.h"
 #include "core/loader/FrameLoader.h"
-#include "core/page/DragActions.h"
 #include "core/page/DragClient.h"
 #include "core/page/DragData.h"
 #include "core/page/DragSession.h"
 #include "core/page/DragState.h"
 #include "core/page/EventHandler.h"
 #include "core/page/Page.h"
 #include "core/page/Settings.h"
 #include "core/platform/DragImage.h"
 #include "core/platform/chromium/ChromiumDataObject.h"
 #include "core/platform/graphics/Image.h"
@@ skipping 893 matching lines @@
     return false;
 #endif
 }
 
 void DragController::cleanupAfterSystemDrag()
 {
 }
 
 } // namespace WebCore