Remove runtime flags for Proxy and Reflect

test/mjsunit/es6/reflect-set-prototype-of.js

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 // This is adapted from mjsunit/harmony/set-prototype-of.js.
 
-// Flags: --harmony-reflect
-
 
 
 function getObjects() {
   function func() {}
   return [
     func,
     new func(),
     {x: 5},
     /regexp/,
     ['array'],
@@ skipping 133 matching lines @@
   assertEquals(object.y, 'old y');
 
   var newProto = {
     x: 'new x'
   };
   assertTrue(Reflect.setPrototypeOf(object, newProto));
   assertEquals(object.x, 'new x');
   assertFalse('y' in object);
 }
 TestLookup();