Adjust handling of timers:

runtime/lib/isolate_patch.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "dart:collection" show HashMap;
 import "dart:_internal";
 
 patch class ReceivePort {
   /* patch */ factory ReceivePort() = _ReceivePortImpl;
 
@@ skipping 123 matching lines @@
     return result;
   }
 
   // Called from the VM to dispatch to the handler.
   static void _handleMessage(Function handler, var message) {
     // TODO(floitsch): this relies on the fact that any exception aborts the
     // VM. Once we have non-fatal global exceptions we need to catch errors
     // so that we can run the immediate callbacks.
     handler(message);
     _runPendingImmediateCallback();
-    // Event was handled. Now run expired timers.
-    _Timer._handleTimeout();
   }
 
   // Call into the VM to close the VM maintained mappings.
   _closeInternal() native "RawReceivePortImpl_closeInternal";
 
   void set handler(Function value) {
     _handlerMap[this._get_id()] = value;
   }
 
   // TODO(iposva): Ideally keep this map in the VM.
@@ skipping 253 matching lines @@
   static Isolate _getCurrentIsolate() {
     List portAndCapabilities = _getPortAndCapabilitiesOfCurrentIsolate();
     return new Isolate(portAndCapabilities[0],
                        pauseCapability: portAndCapabilities[1],
                        terminateCapability: portAndCapabilities[2]);
   }
 
   static List _getPortAndCapabilitiesOfCurrentIsolate()
       native "Isolate_getPortAndCapabilitiesOfCurrentIsolate";
 }