Oilpan: move ImageData to the oilpan heap.

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 175 matching lines @@
                            float dx = 0, float dy = 0, float dw = 0, float dh = 0, const String& compositeOperation = emptyString());
 
     void setAlpha(float);
 
     void setCompositeOperation(const String&);
 
     PassRefPtr<CanvasGradient> createLinearGradient(float x0, float y0, float x1, float y1, ExceptionState&);
     PassRefPtr<CanvasGradient> createRadialGradient(float x0, float y0, float r0, float x1, float y1, float r1, ExceptionState&);
     PassRefPtr<CanvasPattern> createPattern(CanvasImageSource*, const String& repetitionType, ExceptionState&);
 
-    PassRefPtr<ImageData> createImageData(PassRefPtr<ImageData>, ExceptionState&) const;
-    PassRefPtr<ImageData> createImageData(float width, float height, ExceptionState&) const;
-    PassRefPtr<ImageData> getImageData(float sx, float sy, float sw, float sh, ExceptionState&) const;
+    PassRefPtrWillBeRawPtr<ImageData> createImageData(PassRefPtrWillBeRawPtr<ImageData>, ExceptionState&) const;
+    PassRefPtrWillBeRawPtr<ImageData> createImageData(float width, float height, ExceptionState&) const;
+    PassRefPtrWillBeRawPtr<ImageData> getImageData(float sx, float sy, float sw, float sh, ExceptionState&) const;
     void putImageData(ImageData*, float dx, float dy, ExceptionState&);
     void putImageData(ImageData*, float dx, float dy, float dirtyX, float dirtyY, float dirtyWidth, float dirtyHeight, ExceptionState&);
 
     void reset();
 
     String font() const;
     void setFont(const String&);
 
     String textAlign() const;
     void setTextAlign(const String&);
@@ skipping 126 matching lines @@
     bool m_usesCSSCompatibilityParseMode;
     bool m_hasAlpha;
     MutableStylePropertyMap m_fetchedFonts;
 };
 
 DEFINE_TYPE_CASTS(CanvasRenderingContext2D, CanvasRenderingContext, context, context->is2d(), context.is2d());
 
 } // namespace WebCore
 
 #endif