Add back three deprecated DOM APIs removed from Chrome 34

Source/core/dom/Document.idl

Index: Source/core/dom/Document.idl
diff --git a/Source/core/dom/Document.idl b/Source/core/dom/Document.idl
index c628c5dc3c46cde82163aa930bd6901c3f21c7a3..f63709a85188fc540ae09ac3a3e7ed6b5ee5b0da 100644
--- a/Source/core/dom/Document.idl
+++ b/Source/core/dom/Document.idl
@@ -44,6 +44,8 @@ typedef (CanvasRenderingContext2D or WebGLRenderingContext) RenderingContext;
 
     [CustomElementCallbacks, PerWorldBindings, ActivityLogging=ForIsolatedWorlds, RaisesException] Node importNode(Node node, optional boolean deep);
     [CustomElementCallbacks, PerWorldBindings, ActivityLogging=ForIsolatedWorlds, RaisesException] Element createElementNS([TreatNullAs=NullString] DOMString namespaceURI, DOMString qualifiedName);
+    [RaisesException, DeprecateAs=DocumentCreateAttributeNS] Attr createAttributeNS([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI,
+                                                                                  [TreatNullAs=NullString,Default=Undefined] optional DOMString qualifiedName); // Removed from DOM4.
     HTMLCollection getElementsByTagNameNS([TreatNullAs=NullString] DOMString namespaceURI, DOMString localName);
     [PerWorldBindings] Element getElementById(DOMString elementId);