Support for latest WebIDL for indexed property getters.

Source/core/css/CSSValueList.idl

Index: Source/core/css/CSSValueList.idl
diff --git a/Source/core/css/CSSValueList.idl b/Source/core/css/CSSValueList.idl
index 9504c7be7b9ad13e169f3f88e682d08e8eb5e005..ca51d6cc21e320489c02d8e5cf586c1b7a1e90cc 100644
--- a/Source/core/css/CSSValueList.idl
+++ b/Source/core/css/CSSValueList.idl
@@ -25,10 +25,9 @@
 
 // Introduced in DOM Level 2:
 [
-    IndexedGetter,
     ImplementationLacksVTable
 ] interface CSSValueList : CSSValue {
     readonly attribute unsigned long    length;
-    CSSValue           item([Default=Undefined] optional unsigned long index);
+    getter CSSValue           item([Default=Undefined] optional unsigned long index);
 };