Remove ~1750 superfluous includes from core

Source/core/html/canvas/CanvasRenderingContext.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 13 matching lines @@
  */
 
 #include "config.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/html/canvas/CanvasPattern.h"
 #include "core/loader/cache/CachedImage.h"
-#include "core/platform/KURL.h"
 #include "weborigin/SecurityOrigin.h"
 
 namespace WebCore {
 
 CanvasRenderingContext::CanvasRenderingContext(HTMLCanvasElement* canvas)
     : m_canvas(canvas)
 {
     ScriptWrappable::init(this);
 }
 
@@ skipping 56 matching lines @@
     return false;
 }
 
 void CanvasRenderingContext::checkOrigin(const KURL& url)
 {
     if (wouldTaintOrigin(url))
         canvas()->setOriginTainted();
 }
 
 } // namespace WebCore