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

Source/core/html/canvas/OESVertexArrayObject.h

Index: Source/core/html/canvas/OESVertexArrayObject.h
diff --git a/Source/core/html/canvas/OESVertexArrayObject.h b/Source/core/html/canvas/OESVertexArrayObject.h
index ef4be945a6a7c7618a9ff66066712caaccb0a53e..3c08ca0ba1e3c1606de0831c620a9bfd0231cf80 100644
--- a/Source/core/html/canvas/OESVertexArrayObject.h
+++ b/Source/core/html/canvas/OESVertexArrayObject.h
@@ -37,20 +37,20 @@ class WebGLVertexArrayObjectOES;
 
 class OESVertexArrayObject FINAL : public WebGLExtension, public ScriptWrappable {
 public:
-    static PassRefPtr<OESVertexArrayObject> create(WebGLRenderingContextBase*);
+    static PassRefPtrWillBeRawPtr<OESVertexArrayObject> create(WebGLRenderingContextBase*);
     static bool supported(WebGLRenderingContextBase*);
     static const char* extensionName();
 
     virtual ~OESVertexArrayObject();
     virtual WebGLExtensionName name() const OVERRIDE;
 
-    PassRefPtr<WebGLVertexArrayObjectOES> createVertexArrayOES();
+    PassRefPtrWillBeRawPtr<WebGLVertexArrayObjectOES> createVertexArrayOES();
     void deleteVertexArrayOES(WebGLVertexArrayObjectOES*);
     GLboolean isVertexArrayOES(WebGLVertexArrayObjectOES*);
     void bindVertexArrayOES(WebGLVertexArrayObjectOES*);
 
 private:
-    OESVertexArrayObject(WebGLRenderingContextBase*);
+    explicit OESVertexArrayObject(WebGLRenderingContextBase*);
 };
 
 } // namespace blink