Fixed failing JS tests

A couple of small tweaks were needed to fix test failures that were
inadvertently introduced in the last down integration. I also had to add
the map.js file which was missing.

js/test.proto

@@ -229,3 +229,7 @@ message TestMessageWithOneof {
   }
 }
 
+message TestEndsWithBytes {
+  optional int32 value = 1;
+  optional bytes data = 2;
+}

js/testbinary.proto

@@ -185,8 +185,6 @@ extend TestExtendable {
 }
 
 message TestMapFields {
-  option (jspb.generate_from_object) = true;
-
   map<string, string> map_string_string = 1;
   map<string, int32> map_string_int32 = 2;
   map<string, int64> map_string_int64 = 3;