Remove unnecessary language_mode arg from Parser::DefaultConstructor

src/parsing/parser.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSING_PARSER_H_
 #define V8_PARSING_PARSER_H_
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/base/compiler-specific.h"
@@ skipping 500 matching lines @@
                                InitializationFlag init, int pos, bool* ok);
 
   bool TargetStackContainsLabel(const AstRawString* label);
   BreakableStatement* LookupBreakTarget(const AstRawString* label, bool* ok);
   IterationStatement* LookupContinueTarget(const AstRawString* label, bool* ok);
 
   Statement* BuildAssertIsCoercible(Variable* var);
 
   // Factory methods.
   FunctionLiteral* DefaultConstructor(const AstRawString* name, bool call_super,
-                                      int pos, int end_pos,
-                                      LanguageMode language_mode);
+                                      int pos, int end_pos);
 
   // Skip over a lazy function, either using cached data if we have it, or
   // by parsing the function with PreParser. Consumes the ending }.
   // If may_abort == true, the (pre-)parser may decide to abort skipping
   // in order to force the function to be eagerly parsed, after all.
   LazyParsingResult SkipFunction(
       FunctionKind kind, DeclarationScope* function_scope, int* num_parameters,
       int* function_length, bool* has_duplicate_parameters,
       int* materialized_literal_count, int* expected_property_count,
       bool is_inner_function, bool may_abort, bool* ok);
@@ skipping 643 matching lines @@
 
  private:
   ParserTarget** variable_;
   ParserTarget* previous_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_H_