Cleanup following MicrotaskQueue abstraction

src/promise.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 23 matching lines @@
 // var $WeakMap = global.WeakMap
 
 
 var $Promise = Promise;
 
 
 //-------------------------------------------------------------------
 
 // Core functionality.
 
-// Event queue format: [(value, [(handler, deferred)*])*]
-// I.e., a list of value/tasks pairs, where the value is a resolution value or
-// rejection reason, and the tasks are a respective list of handler/deferred
-// pairs waiting for notification of this value. Each handler is an onResolve or
-// onReject function provided to the same call of 'chain' that produced the
-// associated deferred.
-var promiseEvents = new InternalArray;
-
 // Status values: 0 = pending, +1 = resolved, -1 = rejected
 var promiseStatus = NEW_PRIVATE("Promise#status");
 var promiseValue = NEW_PRIVATE("Promise#value");
 var promiseOnResolve = NEW_PRIVATE("Promise#onResolve");
 var promiseOnReject = NEW_PRIVATE("Promise#onReject");
 var promiseRaw = NEW_PRIVATE("Promise#raw");
 
 function IsPromise(x) {
   return IS_SPEC_OBJECT(x) && %HasLocalProperty(x, promiseStatus);
 }
@@ skipping 264 matching lines @@
     "resolve", PromiseCast
   ]);
   InstallFunctions($Promise.prototype, DONT_ENUM, [
     "chain", PromiseChain,
     "then", PromiseThen,
     "catch", PromiseCatch
   ]);
 }
 
 SetUpPromise();