Fix analyzer warnings in dart:_vmservice

sdk/lib/vmservice/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;
+part of dart._vmservice;
 
 class RunningIsolates implements MessageRouter {
   final Map<int, RunningIsolate> isolates = new Map<int, RunningIsolate>();
   int _rootPortId;
 
   RunningIsolates();
 
   void isolateStartup(int portId, SendPort sp, String name) {
     if (_rootPortId == null) {
       _rootPortId = portId;
@@ skipping 37 matching lines @@
         'type' : 'Sentinel',
         'kind' : 'Collected',
         'valueAsString' : '<collected>',
       };
       message.setResponse(encodeResult(message, result));
       return message.response;
     }
     return isolate.route(message);
   }
 }