[Devtools] Added typing to network in prep for removing unrestricted

third_party/WebKit/Source/devtools/front_end/network/NetworkPanel.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008, 2009 Anthony Ricaud <rik@webkit.org>
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 615 matching lines @@
 /**
  * @implements {SDK.TracingManagerClient}
  * @unrestricted
  */
 Network.NetworkPanel.FilmStripRecorder = class {
   /**
    * @param {!Network.NetworkTimeCalculator} timeCalculator
    * @param {!PerfUI.FilmStripView} filmStripView
    */
   constructor(timeCalculator, filmStripView) {
+    /** @type {?SDK.Target} */
+    this._target = null;
     this._timeCalculator = timeCalculator;
     this._filmStripView = filmStripView;
   }
 
   /**
    * @override
    */
   tracingStarted() {
   }
 
   /**
    * @override
    * @param {!Array.<!SDK.TracingManager.EventPayload>} events
    */
   traceEventsCollected(events) {
     if (this._tracingModel)
       this._tracingModel.addEvents(events);
   }
 
   /**
    * @override
    */
   tracingComplete() {
-    if (!this._tracingModel)
+    if (!this._tracingModel || !this._target)
       return;
     this._tracingModel.tracingComplete();
     SDK.targetManager.resumeReload(this._target);
     this._target = null;
     this._callback(new SDK.FilmStripModel(this._tracingModel, this._timeCalculator.minimumBoundary() * 1000));
     delete this._callback;
   }
 
   /**
    * @override
@@ skipping 54 matching lines @@
    * @param {string} actionId
    * @return {boolean}
    */
   handleAction(context, actionId) {
     var panel = UI.context.flavor(Network.NetworkPanel);
     console.assert(panel && panel instanceof Network.NetworkPanel);
     panel._toggleRecording();
     return true;
   }
 };