Cleanup following MicrotaskQueue abstraction

src/promise.js

Index: src/promise.js
diff --git a/src/promise.js b/src/promise.js
index 8947670f0669617a4048350848a9a5419bde10e7..390c19e2aca6b4c0e25efd0eccefc6f7a802840f 100644
--- a/src/promise.js
+++ b/src/promise.js
@@ -41,14 +41,6 @@ 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");