Make TreeScope::baseURL pure virtual

Source/core/dom/shadow/ShadowRoot.h

 /*
  * Copyright (C) 2011 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 109 matching lines @@
 
     String innerHTML() const;
     void setInnerHTML(const String&, ExceptionState&);
 
     PassRefPtr<Node> cloneNode(bool, ExceptionState&);
     PassRefPtr<Node> cloneNode(ExceptionState& exceptionState) { return cloneNode(true, exceptionState); }
 
     StyleSheetList* styleSheets();
 
     // FIXME: Implement baseURI-setting, see http://crbug.com/311682
+    virtual const KURL& baseURL() const OVERRIDE FINAL { return document().baseURL(); }
     // virtual KURL baseURI() const OVERRIDE;
     // void setBaseURI(const String&);
 
 private:
     ShadowRoot(Document*, ShadowRootType);
     virtual ~ShadowRoot();
 
     virtual void dispose() OVERRIDE;
     virtual bool childTypeAllowed(NodeType) const OVERRIDE;
     virtual void childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta) OVERRIDE;
@@ skipping 26 matching lines @@
 {
     return adjustedFocusedElement();
 }
 
 DEFINE_NODE_TYPE_CASTS(ShadowRoot, isShadowRoot());
 DEFINE_TYPE_CASTS(ShadowRoot, TreeScope, treeScope, treeScope->rootNode() && treeScope->rootNode()->isShadowRoot(), treeScope.rootNode() && treeScope.rootNode()->isShadowRoot());
 
 } // namespace
 
 #endif