Add support for [NoInterfaceObject] extended attribute to bindings generator

Source/core/dom/ShadowRoot.idl

 /*
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-interface ShadowRoot : DocumentFragment {
+[
+    EnabledAtRuntime=shadowDOM,
+    InterfaceName=WebKitShadowRoot
+] interface ShadowRoot : DocumentFragment {
     readonly attribute Element activeElement;
     attribute boolean applyAuthorStyles;
     attribute boolean resetStyleInheritance;
 
     [TreatNullAs=NullString, DeliverCustomElementCallbacks, SetterRaisesException] attribute DOMString innerHTML;
 
     [RaisesException] Node cloneNode([Default=Undefined] optional boolean deep);
     DOMSelection getSelection();
     Element getElementById([Default=Undefined] optional DOMString elementId);
     NodeList getElementsByClassName([Default=Undefined] optional DOMString className);
     NodeList getElementsByTagName([Default=Undefined] optional DOMString tagName);
     NodeList getElementsByTagNameNS([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI,
                                     [Default=Undefined] optional DOMString localName);
 
     Element elementFromPoint([Default=Undefined] optional long x, 
                              [Default=Undefined] optional long y);
 };