Make CanvasRenderingContext not inherit from ActiveDOMObject

third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.cpp

 /*
  * 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 13 matching lines @@
  */
 
 #include "core/html/canvas/CanvasRenderingContext.h"
 
 #include "core/html/canvas/CanvasImageSource.h"
 #include "platform/weborigin/SecurityOrigin.h"
 
 namespace blink {
 
 CanvasRenderingContext::CanvasRenderingContext(HTMLCanvasElement* canvas)
-    : ActiveDOMObject(&canvas->document())
-    , m_canvas(canvas)
+    : m_canvas(canvas)
 {
-    suspendIfNeeded();
 }
 
 CanvasRenderingContext::ContextType CanvasRenderingContext::contextTypeFromId(const String& id)
 {
     if (id == "2d")
         return Context2d;
     if (id == "experimental-webgl")
         return ContextExperimentalWebgl;
     if (id == "webgl")
         return ContextWebgl;
@@ skipping 29 matching lines @@
             m_dirtyURLs.add(sourceURL.string());
         else
             m_cleanURLs.add(sourceURL.string());
     }
     return taintOrigin;
 }
 
 DEFINE_TRACE(CanvasRenderingContext)
 {
     visitor->trace(m_canvas);
-    ActiveDOMObject::trace(visitor);
-}
-
-bool CanvasRenderingContext::hasPendingActivity() const
-{
-    return false;
-}
-
-void CanvasRenderingContext::didMoveToNewDocument(Document* document)
-{
-    ActiveDOMObject::didMoveToNewExecutionContext(document);
 }
 
 } // namespace blink