Support for latest WebIDL for indexed property getters.

Source/core/dom/DOMNamedFlowCollection.idl

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 13 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
 [
     Conditional=CSS_REGIONS,
     EnabledAtRuntime=cssRegions,
     InterfaceName=WebKitNamedFlowCollection,
-    IndexedGetter,
     ImplementationLacksVTable
 ] interface DOMNamedFlowCollection {
     readonly attribute unsigned long length;
-    NamedFlow item(unsigned long index);
+    getter NamedFlow item(unsigned long index);
     getter NamedFlow namedItem(DOMString name);
 };