DevTools: allow reattaching main target live.

third_party/WebKit/Source/devtools/front_end/worker_service/ServiceDispatcher.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @interface
  */
 function Service() { }
 
 Service.prototype = {
+    /**
+     * @return {!Promise}
+     */
     dispose: function() { }
 }
 
 /**
  * @constructor
  * @param {!ServicePort} port
  */
 function ServiceDispatcher(port)
 {
     this._constructors = new Map();
@@ skipping 209 matching lines @@
 
     function onNewPort(port)
     {
         var servicePort = new WorkerServicePort(port);
         var dispatcher = new ServiceDispatcher(servicePort);
         dispatchers.push(dispatcher);
         for (var name of services.keys())
             dispatcher.registerObject(name, services.get(name));
     }
 }