[es6] Fix for-const loops

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 882e2ac5f81a74a83bb902d2cc48e115c8e37731..8f13916fde82bfafbc3dddb720afda4a8a27b046 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -763,8 +763,8 @@ class Parser : public ParserBase<ParserTraits> {
                                   Expression* each,
                                   Expression* subject,
                                   Statement* body);
-  Statement* DesugarLetBindingsInForStatement(
-      Scope* inner_scope, ZoneList<const AstRawString*>* names,
+  Statement* DesugarLexicalBindingsInForStatement(
+      Scope* inner_scope, bool is_const, ZoneList<const AstRawString*>* names,
       ForStatement* loop, Statement* init, Expression* cond, Statement* next,
       Statement* body, bool* ok);