Use TreeScope::completeURL and baseURL instead of the Document versions

Source/core/editing/MarkupAccumulator.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009, 2010 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:
  * 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
@@ skipping 125 matching lines @@
     }
 
     if (!childrenOnly)
         appendEndTag(targetNode);
 }
 
 String MarkupAccumulator::resolveURLIfNeeded(const Element* element, const String& urlString) const
 {
     switch (m_resolveURLsMethod) {
     case ResolveAllURLs:
-        return element->document().completeURL(urlString).string();
+        return element->treeScope().completeURL(urlString).string();
 
     case ResolveNonLocalURLs:
         if (!element->document().url().isLocalFile())
-            return element->document().completeURL(urlString).string();
+            return element->treeScope().completeURL(urlString).string();
         break;
 
     case DoNotResolveURLs:
         break;
     }
     return urlString;
 }
 
 void MarkupAccumulator::appendString(const String& string)
 {
@@ skipping 369 matching lines @@
 {
     if (!node->isElementNode() || shouldSelfClose(node) || (!node->hasChildNodes() && elementCannotHaveEndTag(node)))
         return;
 
     result.appendLiteral("</");
     result.append(toElement(node)->nodeNamePreservingCase());
     result.append('>');
 }
 
 }