Move service into VM

runtime/vm/service/running_isolates.dart

 // Copyright (c) 2013, 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.
 
 part of vmservice;
 
 class RunningIsolates implements MessageRouter {
   final Map<int, RunningIsolate> isolates = new Map<int, RunningIsolate>();
 
   RunningIsolates();
 
   void isolateStartup(int portId, SendPort sp, String name) {
-    if (isolates[portId] != null) {
-      throw new StateError('Duplicate isolate startup.');
-    }
     var ri = new RunningIsolate(portId, sp, name);
     isolates[portId] = ri;
   }
 
   void isolateShutdown(int portId, SendPort sp) {
     if (isolates[portId] == null) {
-      throw new StateError('Unknown isolate.');
+      return;
     }
     isolates.remove(portId);
   }
 
   void _isolateCollectionRequest(Message message) {
     var members = [];
     var result = {};
     isolates.forEach((portId, runningIsolate) {
       members.add({
         'type': 'Isolate',
@@ skipping 35 matching lines @@
     // Consume '/isolates/isolateId'
     message.path.removeRange(0, 2);
     if (message.path.length == 0) {
       // The message now has an empty path.
       message.setErrorResponse('Empty path for isolate: /isolates/$isolateId');
       return message.response;
     }
     return isolate.route(message);
   }
 }