Enable ES6 generators

test/mjsunit/es6/generators-objects.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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-// Flags: --harmony-generators --harmony-scoping --allow-natives-syntax
+// Flags: --harmony-scoping --allow-natives-syntax
 
 // Test instantations of generators.
 
 // Generators shouldn't allocate stack slots.  This test will abort in debug
 // mode if generators have stack slots.
 function TestContextAllocation() {
   function* g1(a, b, c) { yield 1; return [a, b, c]; }
   function* g2() { yield 1; return arguments; }
   function* g3() { yield 1; return this; }
   function* g4() { var x = 10; yield 1; return x; }
@@ skipping 45 matching lines @@
     assertThrows(function() { iter.close.call(non_generator); }, TypeError);
   }
 
   TestNonGenerator(1);
   TestNonGenerator({});
   TestNonGenerator(function(){});
   TestNonGenerator(g);
   TestNonGenerator(g.prototype);
 }
 TestGeneratorObjectMethods();