Remove unused includes from various .cpp files in 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 39 matching lines @@
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLPlugInElement.h"
 #include "core/loader/FrameLoadRequest.h"
 #include "core/loader/FrameLoader.h"
 #include "core/loader/cache/CachedImage.h"
 #include "core/loader/cache/CachedResourceLoader.h"
 #include "core/page/DragActions.h"
 #include "core/page/DragClient.h"
 #include "core/page/DragSession.h"
 #include "core/page/DragState.h"
-#include "core/page/EditorClient.h"
 #include "core/page/EventHandler.h"
 #include "core/page/Frame.h"
 #include "core/page/FrameView.h"
 #include "core/page/Page.h"
 #include "core/page/Settings.h"
 #include "core/platform/DragData.h"
-#include "core/platform/PlatformKeyboardEvent.h"
 #include "core/platform/graphics/FloatRect.h"
 #include "core/platform/graphics/Image.h"
 #include "core/platform/graphics/ImageOrientation.h"
 #include "core/platform/network/ResourceRequest.h"
 #include "core/rendering/HitTestRequest.h"
 #include "core/rendering/HitTestResult.h"
-#include "core/rendering/RenderFileUploadControl.h"
 #include "core/rendering/RenderImage.h"
 #include "core/rendering/RenderView.h"
 #include "weborigin/SecurityOrigin.h"
 
 #if OS(WINDOWS)
 #include <windows.h>
 #endif
 
 namespace WebCore {
 
@@ skipping 835 matching lines @@
 #endif
     return maxDragImageSize;
 }
 
 void DragController::cleanupAfterSystemDrag()
 {
 }
 
 } // namespace WebCore