Remove always-true --harmony-restrictive-declarations flag

test/mjsunit/es6/sloppy-restrictive-block-function.js

 // Copyright 2016 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.
 
-// Flags: --harmony-restrictive-declarations
-
 // ES#sec-functiondeclarations-in-ifstatement-statement-clauses
 // Annex B 3.4 FunctionDeclarations in IfStatement Statement Clauses
 // In sloppy mode, function declarations in if statements act like
 // they have a block around them. Prohibited in strict mode.
 (function() {
   if (false) function f() { };
   assertEquals(undefined, f);
 })();
 
 (function() {
@@ skipping 26 matching lines @@
 
 (function() {
   function bar() {
     return f;
     {
       x: function f() {}
     }
   }
   assertEquals(undefined, bar());
 })();