Remove xml:base support

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index ddee2df92be60fbc5fc8bbdf42b2c34de427e6f0..dbc0e659592b75c9688265df5fb185d0d836d5ca 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -1354,27 +1354,6 @@ const AtomicString& Element::locateNamespacePrefix(const AtomicString& namespace
     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);