Make TreeScope::baseURL pure virtual

Source/core/dom/TreeScope.h

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple 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 108 matching lines @@
         }
     }
 
     void removedLastRefToScope();
 
     bool isInclusiveAncestorOf(const TreeScope&) const;
     unsigned short comparePosition(const TreeScope&) const;
 
     Element* getElementByAccessKey(const String& key) const;
 
-    const KURL& baseURL() const { return m_baseURL; }
+    virtual const KURL& baseURL() const = 0;
     KURL completeURL(const String&) const;
 
 protected:
     TreeScope(ContainerNode*, Document*);
     TreeScope(Document*);
     virtual ~TreeScope();
 
     void destroyTreeScopeData();
     void setDocument(Document& document) { m_document = &document; }
     void setParentTreeScope(TreeScope&);
 
     bool hasGuardRefCount() const { return m_guardRefCount; }
 
     void setNeedsStyleRecalcForViewportUnits();
 
-    void setBaseURL(const KURL& baseURL) { m_baseURL = baseURL; }
-
 private:
     virtual void dispose() { }
 
     int refCount() const;
 #if SECURITY_ASSERT_ENABLED
     bool deletionHasBegun();
     void beginDeletion();
 #else
     bool deletionHasBegun() { return false; }
     void beginDeletion() { }
 #endif
 
     bool rootNodeHasTreeSharedParent() const;
 
     Node* m_rootNode;
     Document* m_document;
     TreeScope* m_parentTreeScope;
     int m_guardRefCount;
 
     OwnPtr<DocumentOrderedMap> m_elementsById;
     OwnPtr<DocumentOrderedMap> m_imageMapsByName;
     OwnPtr<DocumentOrderedMap> m_labelsByForAttribute;
 
     OwnPtr<IdTargetObserverRegistry> m_idTargetObserverRegistry;
 
     mutable RefPtr<DOMSelection> m_selection;
-
-    KURL m_baseURL;
 };
 
 inline bool TreeScope::hasElementWithId(StringImpl* id) const
 {
     ASSERT(id);
     return m_elementsById && m_elementsById->contains(id);
 }
 
 inline bool TreeScope::containsMultipleElementsWithId(const AtomicString& id) const
 {
     return m_elementsById && m_elementsById->containsMultiple(id.impl());
 }
 
 inline bool operator==(const TreeScope& a, const TreeScope& b) { return &a == &b; }
 inline bool operator==(const TreeScope& a, const TreeScope* b) { return &a == b; }
 inline bool operator==(const TreeScope* a, const TreeScope& b) { return a == &b; }
 inline bool operator!=(const TreeScope& a, const TreeScope& b) { return !(a == b); }
 inline bool operator!=(const TreeScope& a, const TreeScope* b) { return !(a == b); }
 inline bool operator!=(const TreeScope* a, const TreeScope& b) { return !(a == b); }
 
 RenderObject* rendererFromPoint(Document*, int x, int y, LayoutPoint* localPoint = 0);
 TreeScope* commonTreeScope(Node*, Node*);
 
 } // namespace WebCore
 
 #endif // TreeScope_h