Remove the concept of document.documentElement

sky/engine/web/WebRange.cpp

 /*
  * 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 83 matching lines @@
 {
     WebRange copy(*this);
     copy.m_private->expand("block", IGNORE_EXCEPTION);
     return copy;
 }
 
 // static
 WebRange WebRange::fromDocumentRange(WebLocalFrame* frame, int start, int length)
 {
     LocalFrame* webFrame = toWebLocalFrameImpl(frame)->frame();
-    Element* selectionRoot = webFrame->selection().rootEditableElement();
-    ContainerNode* scope = selectionRoot ? selectionRoot : webFrame->document()->documentElement();
+    ContainerNode* selectionRoot = webFrame->selection().rootEditableElement();
+    ContainerNode* scope = selectionRoot ? selectionRoot : webFrame->document();
     return PlainTextRange(start, start + length).createRange(*scope);
 }
 
 WebRange::WebRange(const PassRefPtr<Range>& range)
     : m_private(range)
 {
 }
 
 WebRange::operator PassRefPtr<Range>() const
 {
     return m_private.get();
 }
 
 } // namespace blink