Remove runtime flags for sloppy mode block scoping features

test/webkit/class-syntax-scoping.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 //
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 // modification, are permitted provided that the following conditions
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-// Flags: --harmony-sloppy
-
 description('Tests for scoping of variables in ES6 class syntax');
 
 var local = "FAIL";
 function test() {
     var local = "PASS";
     class A {
         getLocal(x) { return local; }
     };
     return new A().getLocal();
 }
 
 shouldBe('test()', '"PASS"');
 
 var successfullyParsed = true;