fix fields that override getters/setters

lib/runtime/dart/async.js

 var async;
 (function(exports) {
   'use strict';
   // Function _invokeErrorHandler: (Function, Object, StackTrace) → dynamic
   function _invokeErrorHandler(errorHandler, error, stackTrace) {
     if (dart.is(errorHandler, ZoneBinaryCallback)) {
       return dart.dcall(errorHandler, error, stackTrace);
     } else {
       return dart.dcall(errorHandler, error);
     }
@@ skipping 833 matching lines @@
   let _STATE_FIRING = Symbol('_STATE_FIRING');
   let _setRemoveAfterFiring = Symbol('_setRemoveAfterFiring');
   let _STATE_REMOVE_AFTER_FIRING = Symbol('_STATE_REMOVE_AFTER_FIRING');
   let _removeAfterFiring = Symbol('_removeAfterFiring');
   let _onPause = Symbol('_onPause');
   let _onResume = Symbol('_onResume');
   let _onCancel = Symbol('_onCancel');
   let _recordCancel = Symbol('_recordCancel');
   let _recordPause = Symbol('_recordPause');
   let _recordResume = Symbol('_recordResume');
+  let _STATE_CANCEL_ON_ERROR = Symbol('_STATE_CANCEL_ON_ERROR');
   let _zone = Symbol('_zone');
   let _state = Symbol('_state');
-  let _STATE_CANCEL_ON_ERROR = Symbol('_STATE_CANCEL_ON_ERROR');
   let _onData = Symbol('_onData');
   let _onError = Symbol('_onError');
   let _onDone = Symbol('_onDone');
   let _cancelFuture = Symbol('_cancelFuture');
   let _pending = Symbol('_pending');
   let _setPendingEvents = Symbol('_setPendingEvents');
   let _STATE_HAS_PENDING = Symbol('_STATE_HAS_PENDING');
   let _extractPending = Symbol('_extractPending');
   let _isCanceled = Symbol('_isCanceled');
   let _isPaused = Symbol('_isPaused');
@@ skipping 2711 matching lines @@
       asFuture(futureValue) {
         if (futureValue === void 0)
           futureValue = null;
         throw new core.UnsupportedError("Cannot change handlers of asBroadcastStream source subscription.");
       }
     }
     _BroadcastSubscriptionWrapper[dart.implements] = () => [StreamSubscription$(T)];
     return _BroadcastSubscriptionWrapper;
   });
   let _BroadcastSubscriptionWrapper = _BroadcastSubscriptionWrapper$();
+  let _STATE_FOUND = Symbol('_STATE_FOUND');
   let _current = Symbol('_current');
   let _futureOrPrefetch = Symbol('_futureOrPrefetch');
-  let _STATE_FOUND = Symbol('_STATE_FOUND');
   let _STATE_DONE = Symbol('_STATE_DONE');
   let _STATE_MOVING = Symbol('_STATE_MOVING');
   let _STATE_EXTRA_DATA = Symbol('_STATE_EXTRA_DATA');
   let _STATE_EXTRA_ERROR = Symbol('_STATE_EXTRA_ERROR');
   let _clear = Symbol('_clear');
   let _STATE_EXTRA_DONE = Symbol('_STATE_EXTRA_DONE');
   let _StreamIteratorImpl$ = dart.generic(function(T) {
     class _StreamIteratorImpl extends core.Object {
       _StreamIteratorImpl(stream) {
         this[_subscription] = null;
@@ skipping 1651 matching lines @@
   exports.ScheduleMicrotaskHandler = ScheduleMicrotaskHandler;
   exports.CreateTimerHandler = CreateTimerHandler;
   exports.CreatePeriodicTimerHandler = CreatePeriodicTimerHandler;
   exports.PrintHandler = PrintHandler;
   exports.ForkHandler = ForkHandler;
   exports.ZoneSpecification = ZoneSpecification;
   exports.ZoneDelegate = ZoneDelegate;
   exports.Zone = Zone;
   exports.runZoned = runZoned;
 })(async || (async = {}));