[Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/core/html/HTMLCanvasElement.h

 /*
  * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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.
@@ skipping 93 matching lines @@
     // Used for rendering
     void didDraw(const FloatRect&);
 
     void paint(GraphicsContext*, const LayoutRect&);
 
     SkCanvas* drawingCanvas() const;
     void disableDeferral() const;
     SkCanvas* existingDrawingCanvas() const;
 
     void setRenderingContext(PassOwnPtrWillBeRawPtr<CanvasRenderingContext>);
-    CanvasRenderingContext* renderingContext() const { return m_context.get(); }
+    CanvasRenderingContext* renderingContext() const;
 
     void ensureUnacceleratedImageBuffer();
     ImageBuffer* buffer() const;
     PassRefPtr<Image> copiedImage(SourceDrawingBuffer, AccelerationHint) const;
     void clearCopiedImage();
 
     SecurityOrigin* securityOrigin() const;
     bool originClean() const;
     void setOriginTainted() { m_originClean = false; }
 
@@ skipping 87 matching lines @@
     mutable bool m_didFailToCreateImageBuffer;
     bool m_imageBufferIsClear;
     OwnPtr<ImageBuffer> m_imageBuffer;
 
     mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue).
 };
 
 } // namespace blink
 
 #endif // HTMLCanvasElement_h