Remove unnecessary coupling between Promise tests and Object.observe

test/mjsunit/es6/debug-promises/reject-with-throw-in-reject.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --expose-debug-as debug --allow-natives-syntax
 
 // Test debug events when a Promise is rejected, which is caught by a
 // custom promise, which throws a new exception in its reject handler.
 // We expect two Exception debug events:
 //  1) when promise q is rejected.
@@ skipping 60 matching lines @@
         assertEquals(["resolve", "construct", "end main",
                       "reject caught", "throw in reject"], log);
       } else {
         testDone(iteration + 1);
       }
     } catch (e) {
       %AbortJS(e + "\n" + e.stack);
     }
   }
 
-  // Run testDone through the Object.observe processing loop.
-  var dummy = {};
-  Object.observe(dummy, checkResult);
-  dummy.dummy = dummy;
+  %EnqueueMicrotask(checkResult);
 }
 
 testDone(0);