Don't reflect ES2015 Function name inference in Function.prototype.toString

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index c1d8afd6dd264330258e02420c1a930c63e66afc..62bd066cd4e2660d96a919c94133f9b97a0a2c4e 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -569,7 +569,6 @@ class ParserTraits {
       const AstRawString* name, Scanner::Location function_name_location,
       FunctionNameValidity function_name_validity, FunctionKind kind,
       int function_token_position, FunctionLiteral::FunctionType type,
-      FunctionLiteral::ArityRestriction arity_restriction,
       LanguageMode language_mode, bool* ok);
   V8_INLINE void SkipLazyFunctionBody(
       int* materialized_literal_count, int* expected_property_count, bool* ok,
@@ -934,7 +933,6 @@ class Parser : public ParserBase<ParserTraits> {
       const AstRawString* name, Scanner::Location function_name_location,
       FunctionNameValidity function_name_validity, FunctionKind kind,
       int function_token_position, FunctionLiteral::FunctionType type,
-      FunctionLiteral::ArityRestriction arity_restriction,
       LanguageMode language_mode, bool* ok);