Add back three deprecated DOM APIs removed from Chrome 34

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 4409 matching lines @@
 {
     if (m_contextDocument)
         return m_contextDocument;
     if (m_frame)
         return m_weakFactory.createWeakPtr();
     return WeakPtr<Document>(nullptr);
 }
 
 PassRefPtr<Attr> Document::createAttribute(const AtomicString& name, ExceptionState& exceptionState)
 {
+    return createAttributeNS(nullAtom, name, exceptionState, true);
+}
+
+PassRefPtr<Attr> Document::createAttributeNS(const AtomicString& namespaceURI, const AtomicString& qualifiedName, ExceptionState& exceptionState, bool shouldIgnoreNamespaceChecks)
+{
     AtomicString prefix, localName;
-    if (!parseQualifiedName(name, prefix, localName, exceptionState))
+    if (!parseQualifiedName(qualifiedName, prefix, localName, exceptionState))
         return nullptr;
 
-    QualifiedName qName(prefix, localName, nullAtom);
+    QualifiedName qName(prefix, localName, namespaceURI);
+
+    if (!shouldIgnoreNamespaceChecks && !hasValidNamespaceForAttributes(qName)) {
+        exceptionState.throwDOMException(NamespaceError, "The namespace URI provided ('" + namespaceURI + "') is not valid for the qualified name provided ('" + qualifiedName + "').");
+        return nullptr;
+    }
 
     return Attr::create(*this, qName, emptyAtom);
 }
 
 const SVGDocumentExtensions* Document::svgExtensions()
 {
     return m_svgExtensions.get();
 }
 
 SVGDocumentExtensions& Document::accessSVGExtensions()
@@ skipping 1136 matching lines @@
         (*it)->invalidateCache(attrName);
 }
 
 void Document::trace(Visitor* visitor)
 {
     Supplementable<Document>::trace(visitor);
     ContainerNode::trace(visitor);
 }
 
 } // namespace WebCore