Enable --harmony-trailing-commas

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 3a836a94dec335fd0fce7ef588918f12e6b8c800..c37e9c4075fef8285b6f44d8f949ccba1f9e629b 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -550,7 +550,6 @@ Parser::Parser(ParseInfo* info)
   set_allow_harmony_do_expressions(FLAG_harmony_do_expressions);
   set_allow_harmony_function_sent(FLAG_harmony_function_sent);
   set_allow_harmony_restrictive_generators(FLAG_harmony_restrictive_generators);
-  set_allow_harmony_trailing_commas(FLAG_harmony_trailing_commas);
   set_allow_harmony_class_fields(FLAG_harmony_class_fields);
   set_allow_harmony_object_spread(FLAG_harmony_object_spread);
   for (int feature = 0; feature < v8::Isolate::kUseCounterFeatureCount;
@@ -2747,7 +2746,6 @@ Parser::LazyParsingResult Parser::SkipFunction(
     SET_ALLOW(natives);
     SET_ALLOW(harmony_do_expressions);
     SET_ALLOW(harmony_function_sent);
-    SET_ALLOW(harmony_trailing_commas);
     SET_ALLOW(harmony_class_fields);
     SET_ALLOW(harmony_object_spread);
 #undef SET_ALLOW