Remove --harmony-for-in flag which is always false

test/mjsunit/for-in.js

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-// Flags: --noharmony-for-in
-
 function props(x) {
   var array = [];
   for (var p in x) array.push(p);
   return array;
 }
 
 (function forInBasic() {
   assertEquals(0, props({}).length, "olen0");
   assertEquals(1, props({x:1}).length, "olen1");
   assertEquals(2, props({x:1, y:2}).length, "olen2");
@@ skipping 94 matching lines @@
   assertEquals(1, props(a).length, "proplen1");
   a[Math.pow(2,31)-1] = 0;
   assertEquals(2, props(a).length, "proplen2");
   a[1] = 0;
   assertEquals(3, props(a).length, "proplen3");
 })();
 
 (function forInInitialize() {
   for (var hest = 'hest' in {}) { }
   assertEquals('hest', hest, "empty-no-override");
+
+  // Lexical variables are disallowed
+  assertThrows("for (const x = 0 in {});", SyntaxError);
+  assertThrows("for (let x = 0 in {});", SyntaxError);
+
+  // In strict mode, var is disallowed
+  assertThrows("'use strict'; for (var x = 0 in {});", SyntaxError);
 })();
 
 (function forInObjects() {
   var result = '';
   for (var p in {a : [0], b : 1}) { result += p; }
   assertEquals('ab', result, "ab");
 
   var result = '';
   for (var p in {a : {v:1}, b : 1}) { result += p; }
   assertEquals('ab', result, "ab-nodeep");
@@ skipping 77 matching lines @@
     assertUnreachable();
   }
 })();
 
 (function testNonEnumerableSloppyArgumentsIndex(a) {
   Object.defineProperty(arguments, 0, {enumerable:false});
   for (var k in arguments) {
     assertUnreachable();
   }
 })(true);