Remove the concept of document.documentElement

sky/engine/public/web/WebDocument.h

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 60 matching lines @@
 
     BLINK_EXPORT WebString encoding() const;
     BLINK_EXPORT WebString contentLanguage() const;
     BLINK_EXPORT WebString referrer() const;
     // The url of the OpenSearch Desription Document (if any).
     BLINK_EXPORT WebURL openSearchDescriptionURL() const;
 
     // Returns the frame the document belongs to or 0 if the document is frameless.
     BLINK_EXPORT WebLocalFrame* frame() const;
 
-    BLINK_EXPORT WebElement documentElement() const;
     BLINK_EXPORT WebString title() const;
     BLINK_EXPORT WebURL completeURL(const WebString&) const;
     BLINK_EXPORT WebElement getElementById(const WebString&) const;
     BLINK_EXPORT WebElement focusedElement() const;
     BLINK_EXPORT WebReferrerPolicy referrerPolicy() const;
     BLINK_EXPORT WebElement createElement(const WebString& tagName);
 
     BLINK_EXPORT void pauseAnimationsForTesting(double pauseTime) const;
 
 
 #if BLINK_IMPLEMENTATION
     WebDocument(const PassRefPtr<Document>&);
     WebDocument& operator=(const PassRefPtr<Document>&);
     operator PassRefPtr<Document>() const;
 #endif
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_PUBLIC_WEB_WEBDOCUMENT_H_