Remove --harmony-exponentiation-operator flag

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index c93a052ff4915009b361039e6741fd231da4e5f5..239c4c89d57051248e7ef61b6e289511b5752295 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -839,8 +839,6 @@ Parser::Parser(ParseInfo* info)
   set_allow_harmony_function_sent(FLAG_harmony_function_sent);
   set_allow_harmony_restrictive_declarations(
       FLAG_harmony_restrictive_declarations);
-  set_allow_harmony_exponentiation_operator(
-      FLAG_harmony_exponentiation_operator);
   set_allow_harmony_async_await(FLAG_harmony_async_await);
   set_allow_harmony_restrictive_generators(FLAG_harmony_restrictive_generators);
   set_allow_harmony_trailing_commas(FLAG_harmony_trailing_commas);
@@ -4976,7 +4974,6 @@ PreParser::PreParseResult Parser::ParseLazyFunctionBodyWithPreParser(
     SET_ALLOW(harmony_do_expressions);
     SET_ALLOW(harmony_for_in);
     SET_ALLOW(harmony_function_sent);
-    SET_ALLOW(harmony_exponentiation_operator);
     SET_ALLOW(harmony_restrictive_declarations);
     SET_ALLOW(harmony_async_await);
     SET_ALLOW(harmony_trailing_commas);