restore arrow function bind this workaround

lib/runtime/dart/_isolate_helper.js

 dart_library.library('dart/_isolate_helper', null, /* Imports */[
   "dart_runtime/dart",
   'dart/core',
   'dart/_interceptors',
   'dart/_js_helper',
   'dart/isolate',
   'dart/_foreign_helper',
   'dart/collection',
   'dart/async'
 ], /* Lazy imports */[
@@ skipping 1259 matching lines @@
       let isolate = exports._globalState.isolates.get(this[_isolateId]);
       if (isolate == null)
         return;
       if (dart.notNull(this[_receivePort][_isClosed]))
         return;
       let msg = _clone(message);
       if (dart.equals(isolate.controlPort, this[_receivePort])) {
         isolate.handleControlMessage(msg);
         return;
       }
-      exports._globalState.topEventLoop.enqueue(isolate, dart.fn(() => {
+      exports._globalState.topEventLoop.enqueue(isolate, dart.fn((() => {
         if (!dart.notNull(this[_receivePort][_isClosed])) {
           this[_receivePort][_add](msg);
         }
-      }), `receive ${message}`);
+      }).bind(this)), `receive ${message}`);
     }
     ['=='](other) {
       return dart.is(other, _NativeJsSendPort) && dart.equals(this[_receivePort], dart.dload(other, _receivePort));
     }
     get hashCode() {
       return this[_receivePort][_id];
     }
   }
   _NativeJsSendPort[dart.implements] = () => [isolate.SendPort];
   dart.setSignature(_NativeJsSendPort, {
@@ skipping 169 matching lines @@
         dart.assert(dart.notNull(milliseconds) > 0);
         dart.throw(new core.UnsupportedError("Timer greater than 0."));
       }
     }
     periodic(milliseconds, callback) {
       this[_once] = false;
       this[_inEventLoop] = false;
       this[_handle] = null;
       if (dart.notNull(hasTimer())) {
         enterJsAsync();
-        this[_handle] = self.setInterval(dart.fn(() => {
+        this[_handle] = self.setInterval(dart.fn((() => {
           callback(this);
-        }), milliseconds);
+        }).bind(this)), milliseconds);
       } else {
         dart.throw(new core.UnsupportedError("Periodic timer."));
       }
     }
     cancel() {
       if (dart.notNull(hasTimer())) {
         if (dart.notNull(this[_inEventLoop])) {
           dart.throw(new core.UnsupportedError("Timer in event loop cannot be canceled."));
         }
         if (this[_handle] == null)
@@ skipping 67 matching lines @@
   exports.leaveJsAsync = leaveJsAsync;
   exports.isWorker = isWorker;
   exports.startRootIsolate = startRootIsolate;
   exports.IsolateNatives = IsolateNatives;
   exports.RawReceivePortImpl = RawReceivePortImpl;
   exports.ReceivePortImpl = ReceivePortImpl;
   exports.TimerImpl = TimerImpl;
   exports.hasTimer = hasTimer;
   exports.CapabilityImpl = CapabilityImpl;
 });