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

third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.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.
 /**
  * @unrestricted
  */
 Network.NetworkLogViewColumns = class {
   /**
    * @param {!Network.NetworkLogView} networkLogView
    * @param {!Network.NetworkTransferTimeCalculator} timeCalculator
@@ skipping 133 matching lines @@
     this.switchViewMode(false);
 
     /**
      * @param {!Event} event
      * @this {Network.NetworkLogViewColumns}
      */
     function handleContextMenu(event) {
       var node = this._waterfallColumn.getNodeFromPoint(event.offsetX, event.offsetY);
       if (!node)
         return;
+      var request = node.request();
+      if (!request)
+        return;
       var contextMenu = new UI.ContextMenu(event);
-      this._networkLogView.handleContextMenuForRequest(contextMenu, node.request());
+      this._networkLogView.handleContextMenuForRequest(contextMenu, request);
       contextMenu.show();
     }
   }
 
   /**
    * @param {boolean} shouldConsume
    * @param {!Event} event
    */
   _onMouseWheel(shouldConsume, event) {
     if (shouldConsume)
@@ skipping 637 matching lines @@
 /**
  * @enum {string}
  */
 Network.NetworkLogViewColumns.WaterfallSortIds = {
   StartTime: 'startTime',
   ResponseTime: 'responseReceivedTime',
   EndTime: 'endTime',
   Duration: 'duration',
   Latency: 'latency'
 };