Revert of Disable non-standard Promise functions in staging

test/mjsunit/es6/promises.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 //       notice, this list of conditions and the following disclaimer.
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-// Flags: --allow-natives-syntax --harmony-tostring --promise-extra
+// Flags: --allow-natives-syntax --harmony-tostring
 
 // Make sure we don't rely on functions patchable by monkeys.
 var call = Function.prototype.call.call.bind(Function.prototype.call)
 var getOwnPropertyNames = Object.getOwnPropertyNames;
 var defineProperty = Object.defineProperty;
 var numberPrototype = Number.prototype;
 var symbolIterator = Symbol.iterator;
 
 
 (function() {
@@ skipping 1071 matching lines @@
   var p = Promise.resolve();
   var callCount = 0;
   defineProperty(p, "constructor", {
     get: function() { ++callCount; return Promise; }
   });
   p.then();
   assertEquals(1, callCount);
 })();
 
 assertAsyncDone()