Change the return type of WTF::bind() to |OwnPtr<Function>|

Source/core/html/canvas/CanvasRenderingContext2D.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 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 326 matching lines @@
     void drawTextInternal(const String& text, float x, float y, bool fill, float maxWidth = 0, bool useMaxWidth = false);
 
     const Font& accessFont();
     int getFontBaseline(const FontMetrics&) const;
 
     void clearCanvas();
     bool rectContainsTransformedRect(const FloatRect&, const FloatRect&) const;
 
     void inflateStrokeRect(FloatRect&) const;
 
-    void fullCanvasCompositedDraw(const Closure& draw);
+    void fullCanvasCompositedDraw(PassOwnPtr<Closure> draw);
 
     void drawFocusIfNeededInternal(const Path&, Element*);
     bool focusRingCallIsValid(const Path&, Element*);
     void drawFocusRing(const Path&);
 
     bool hasClip() { return state().m_hasClip; }
 
     void validateStateStack();
 
     virtual bool is2d() const override { return true; }
@@ skipping 20 matching lines @@
     Timer<CanvasRenderingContext2D> m_dispatchContextLostEventTimer;
     Timer<CanvasRenderingContext2D> m_dispatchContextRestoredEventTimer;
     Timer<CanvasRenderingContext2D> m_tryRestoreContextEventTimer;
 };
 
 DEFINE_TYPE_CASTS(CanvasRenderingContext2D, CanvasRenderingContext, context, context->is2d(), context.is2d());
 
 } // namespace blink
 
 #endif // CanvasRenderingContext2D_h