Add support for [NoInterfaceObject] extended attribute to bindings generator

Source/core/dom/ShadowRoot.idl

Index: Source/core/dom/ShadowRoot.idl
diff --git a/Source/core/dom/ShadowRoot.idl b/Source/core/dom/ShadowRoot.idl
index 0b9cd70c7d063b881fb9de47d6eb51c950e996ef..cae31618547f862dc388b93bf8e6b6cb2605cbba 100644
--- a/Source/core/dom/ShadowRoot.idl
+++ b/Source/core/dom/ShadowRoot.idl
@@ -24,7 +24,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-interface ShadowRoot : DocumentFragment {
+[
+    EnabledAtRuntime=shadowDOM,
+    InterfaceName=WebKitShadowRoot
+] interface ShadowRoot : DocumentFragment {
     readonly attribute Element activeElement;
     attribute boolean applyAuthorStyles;
     attribute boolean resetStyleInheritance;