Refactoring source image usage in CanvasRenderingContext2D

Source/core/html/canvas/CanvasRenderingContext.h

 /*
  * 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 17 matching lines @@
 
 #include "core/html/HTMLCanvasElement.h"
 #include "wtf/HashSet.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/text/StringHash.h"
 
 namespace blink { class WebLayer; }
 
 namespace WebCore {
 
-class CanvasPattern;
 class HTMLCanvasElement;
-class HTMLImageElement;
-class HTMLVideoElement;
 class KURL;
 class WebGLObject;
 
 class CanvasRenderingContext {
     WTF_MAKE_NONCOPYABLE(CanvasRenderingContext); WTF_MAKE_FAST_ALLOCATED;
 public:
     virtual ~CanvasRenderingContext() { }
 
     void ref() { m_canvas->ref(); }
     void deref() { m_canvas->deref(); }
     HTMLCanvasElement* canvas() const { return m_canvas; }
 
     virtual bool is2d() const { return false; }
     virtual bool is3d() const { return false; }
     virtual bool isAccelerated() const { return false; }
     virtual bool hasAlpha() const { return true; }
 
     virtual void paintRenderingResultsToCanvas() {}
 
     virtual blink::WebLayer* platformLayer() const { return 0; }
-
 protected:
     CanvasRenderingContext(HTMLCanvasElement*);
-    bool wouldTaintOrigin(const CanvasPattern*);
-    bool wouldTaintOrigin(const HTMLCanvasElement*);
-    bool wouldTaintOrigin(const HTMLImageElement*);
-    bool wouldTaintOrigin(const HTMLVideoElement*);
-    bool wouldTaintOrigin(const KURL&);
-
-    template<class T> void checkOrigin(const T* arg)
-    {
-        if (wouldTaintOrigin(arg))
-            canvas()->setOriginTainted();
-    }
-    void checkOrigin(const KURL&);
 
 private:
     HTMLCanvasElement* m_canvas;
-    HashSet<String> m_cleanURLs;
 };
 
 } // namespace WebCore
 
 #endif