Oilpan: move 2D Canvas and WebGL objects to the heap.

Source/core/html/canvas/WebGLBuffer.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 19 matching lines @@
 #include "core/html/canvas/WebGLSharedObject.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class WebGLBuffer FINAL : public WebGLSharedObject, public ScriptWrappable {
 public:
     virtual ~WebGLBuffer();
 
-    static PassRefPtr<WebGLBuffer> create(WebGLRenderingContextBase*);
+    static PassRefPtrWillBeRawPtr<WebGLBuffer> create(WebGLRenderingContextBase*);
 
     GLenum getTarget() const { return m_target; }
     void setTarget(GLenum);
 
     bool hasEverBeenBound() const { return object() && m_target; }
 
 protected:
-    WebGLBuffer(WebGLRenderingContextBase*);
+    explicit WebGLBuffer(WebGLRenderingContextBase*);
 
     virtual void deleteObjectImpl(blink::WebGraphicsContext3D*, Platform3DObject) OVERRIDE;
 
 private:
     virtual bool isBuffer() const OVERRIDE { return true; }
 
     GLenum m_target;
 };
 
 } // namespace blink
 
 #endif // WebGLBuffer_h