Support for latest WebIDL for indexed property getters.

Source/core/css/CSSRuleList.idl

Index: Source/core/css/CSSRuleList.idl
diff --git a/Source/core/css/CSSRuleList.idl b/Source/core/css/CSSRuleList.idl
index 5e6ef7a45f64c34b1aaf36b1f60f05130721508f..0cbc65682c33a8c1daf905df0a8c23756dcfc554 100644
--- a/Source/core/css/CSSRuleList.idl
+++ b/Source/core/css/CSSRuleList.idl
@@ -25,11 +25,10 @@
 
 // Introduced in DOM Level 2:
 [
-    IndexedGetter,
     DependentLifetime,
     SkipVTableValidation
 ] interface CSSRuleList {
     readonly attribute unsigned long    length;
-    CSSRule           item([Default=Undefined] optional unsigned long index);
+    getter CSSRule           item([Default=Undefined] optional unsigned long index);
 };