Remove CanvasRenderingContext from the web exposed objects

Source/core/html/canvas/WebGLRenderingContextBase.h

Index: Source/core/html/canvas/WebGLRenderingContextBase.h
diff --git a/Source/core/html/canvas/WebGLRenderingContextBase.h b/Source/core/html/canvas/WebGLRenderingContextBase.h
index c0ca96c1a8492a05cd07db547725006a9013fad4..11c310947dcd053b042a467b203b50a54e0b2752 100644
--- a/Source/core/html/canvas/WebGLRenderingContextBase.h
+++ b/Source/core/html/canvas/WebGLRenderingContextBase.h
@@ -26,6 +26,7 @@
 #ifndef WebGLRenderingContextBase_h
 #define WebGLRenderingContextBase_h
 
+#include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/html/canvas/WebGLExtensionName.h"
@@ -93,7 +94,7 @@ class WebGLVertexArrayObjectOES;
 class WebGLRenderingContextLostCallback;
 class WebGLRenderingContextErrorMessageCallback;
 
-class WebGLRenderingContextBase : public CanvasRenderingContext, public ActiveDOMObject, private Page::MultisamplingChangedObserver {
+class WebGLRenderingContextBase: public ScriptWrappable, public CanvasRenderingContext, public ActiveDOMObject, private Page::MultisamplingChangedObserver {
 public:
     virtual ~WebGLRenderingContextBase();