Support for latest WebIDL for indexed property getters.

Source/core/dom/DOMStringList.idl

Index: Source/core/dom/DOMStringList.idl
diff --git a/Source/core/dom/DOMStringList.idl b/Source/core/dom/DOMStringList.idl
index 6eccd570f1c1fd4a9fe537ed44ed0170e9fc620e..5109dc6c21e340f816b1ea647a5678bf0a1b6e9a 100644
--- a/Source/core/dom/DOMStringList.idl
+++ b/Source/core/dom/DOMStringList.idl
@@ -24,11 +24,10 @@
  */
 
 [
-    IndexedGetter,
     ImplementationLacksVTable
 ] interface DOMStringList {
     readonly attribute unsigned long length;
-    [TreatReturnedNullStringAs=Null] DOMString item([Default=Undefined] optional unsigned long index);
+    [TreatReturnedNullStringAs=Null] getter DOMString item([Default=Undefined] optional unsigned long index);
     boolean contains([Default=Undefined] optional DOMString string);
 };