Remove xml:base support

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1336 matching lines @@
         if (attr.prefix() == xmlnsAtom && attr.value() == namespaceToLocate)
             return attr.localName();
     }
 
     if (Element* parent = parentElement())
         return parent->locateNamespacePrefix(namespaceToLocate);
 
     return nullAtom;
 }
 
-KURL Element::baseURI() const
-{
-    const AtomicString& baseAttribute = fastGetAttribute(baseAttr);
-    if (!baseAttribute.isEmpty())
-        UseCounter::count(document(), UseCounter::ElementBaseURIFromXMLBase);
-
-    KURL base(KURL(), baseAttribute);
-    if (!base.protocol().isEmpty())
-        return base;
-
-    ContainerNode* parent = parentNode();
-    if (!parent)
-        return base;
-
-    const KURL& parentBase = parent->baseURI();
-    if (parentBase.isNull())
-        return base;
-
-    return KURL(parentBase, baseAttribute);
-}
-
 const AtomicString Element::imageSourceURL() const
 {
     return getAttribute(srcAttr);
 }
 
 bool Element::layoutObjectIsNeeded(const ComputedStyle& style)
 {
     return style.display() != NONE;
 }
 
@@ skipping 2109 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink