DevTools: enable private field checks as a part of compilation.

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

 /*
  * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 194 matching lines @@
     super({data: dataText, length: length, time: timeNode});
 
     this._url = url;
     this._frame = frame;
     this._isTextFrame = isTextFrame;
     this._dataText = dataText;
   }
 
   /**
    * @override
+   * @param {!Element} element
    */
-  createCells() {
-    var element = this._element;
+  createCells(element) {
     element.classList.toggle(
         'websocket-frame-view-row-error', this._frame.type === SDK.NetworkRequest.WebSocketFrameType.Error);
     element.classList.toggle(
         'websocket-frame-view-row-outcoming', this._frame.type === SDK.NetworkRequest.WebSocketFrameType.Send);
     element.classList.toggle('websocket-frame-view-row-opcode', !this._isTextFrame);
-    super.createCells();
+    super.createCells(element);
   }
 
   /**
    * @override
    * @return {number}
    */
   nodeSelfHeight() {
     return 17;
   }
 
   /**
    * @return {!Common.ContentProvider}
    */
   contentProvider() {
     return Common.StaticContentProvider.fromString(this._url, Common.resourceTypes.WebSocket, this._dataText);
   }
 };
 
 /**
  * @param {!Network.ResourceWebSocketFrameNode} a
  * @param {!Network.ResourceWebSocketFrameNode} b
  * @return {number}
  */
 Network.ResourceWebSocketFrameNodeTimeComparator = function(a, b) {
   return a._frame.time - b._frame.time;
 };