Revert the merge. Mac build is mysteriously broken.

third_party/WebKit/WebCore/bindings/js/JSDocumentCustom.cpp

 /*
  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 26 matching lines @@
 #include "JSSVGDocument.h"
 #include "SVGDocument.h"
 #endif
 
 using namespace JSC;
 
 namespace WebCore {
 
 void JSDocument::mark()
 {
-    JSNode::mark();
+    JSEventTargetNode::mark();
     markDOMNodesForDocument(impl());
     markActiveObjectsForContext(*Heap::heap(this)->globalData(), impl());
 }
 
 JSValuePtr JSDocument::location(ExecState* exec) const
 {
     Frame* frame = static_cast<Document*>(impl())->frame();
     if (!frame)
         return jsNull();
 
@@ skipping 43 matching lines @@
         for (Node* n = document; n; n = n->traverseNextNode())
             nodeCount++;
         
         exec->heap()->reportExtraMemoryCost(nodeCount * sizeof(Node));
     }
 
     return wrapper;
 }
 
 } // namespace WebCore