Revert of Parse arrow functions at proper precedence level

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 23ea714a75052b4c940dcad745d351b6390e31bf..ecc65301350c9e61805e5bb7ca71aae054704961 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -3931,8 +3931,6 @@
     ParserFormalParameters* parameters, Expression* expr,
     const Scanner::Location& params_loc,
     Scanner::Location* duplicate_loc, bool* ok) {
-  if (expr->IsEmptyParentheses()) return;
-
   ParseArrowFunctionFormalParameters(parameters, expr, params_loc,
                                      duplicate_loc, ok);
   if (!*ok) return;