remove duped IIterable for ObjMap

Author: swannodette

src/main/cljs/cljs/core.cljs

@@ -12672,13 +12672,6 @@ reduces them without incurring seq initialization"
   (-dissoc! [coll key]
     (-dissoc coll key))
 
-  IIterable
-  (-iterator [coll]
-    (let [xs (-seq coll)]
-      (if (some? xs)
-        (-iterator xs)
-        (nil-iter))))
-
   IPrintWithWriter
   (-pr-writer [coll writer opts]
     (print-map coll pr-writer writer opts)))