Down integrate to GitHub (#6893)

diff --git a/js/map.js b/js/map.js
index ab852e4..589a293 100644
--- a/js/map.js
+++ b/js/map.js
@@ -208,14 +208,14 @@
   }
 };
 
-
 if (typeof(Symbol) != 'undefined') {
-/** @override */
-jspb.Map.ArrayIteratorIterable_.prototype[Symbol.iterator] = function() {
-  return this;
-};
+  /** @override */
+  jspb.Map.ArrayIteratorIterable_.prototype[Symbol.iterator] = function() {
+    return this;
+  };
 }
 
+
 /**
  * Returns the map's length (number of key/value pairs).
  * @return {number}