Make indexed intercepted methods enumerable by default.

R=ulan@chromium.org
BUG=162606

Review URL: https://codereview.chromium.org/11348222

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13053 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -3397,7 +3397,7 @@ PropertyAttributes JSObject::GetElementAttributeWithInterceptor(
       VMState state(isolate, EXTERNAL);
       result = getter(index, info);
     }
-    if (!result.IsEmpty()) return DONT_ENUM;
+    if (!result.IsEmpty()) return NONE;
   }
 
   return holder->GetElementAttributeWithoutInterceptor(