DevTools: do not allow using 'this' before call into super.

third_party/WebKit/Source/devtools/front_end/elements/ClassesPaneWidget.js

 // Copyright (c) 2015 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.
 
 /**
  * @constructor
  * @extends {WebInspector.Widget}
  */
 WebInspector.ClassesPaneWidget = function()
 {
@@ skipping 206 matching lines @@
         return this._button;
     }
 };
 
 /**
  * @constructor
  * @extends {WebInspector.TextPrompt}
  */
 WebInspector.ClassesPaneWidget.ClassNamePrompt = function()
 {
-    WebInspector.TextPrompt.call(this, this._buildClassNameCompletions.bind(this), " ");
+    WebInspector.TextPrompt.call(this);
+    this.initialize(this._buildClassNameCompletions.bind(this), " ");
     this.setSuggestBoxEnabled(true);
     this.disableDefaultSuggestionForEmptyInput();
     this._selectedFrameId = "";
     this._classNamesPromise = null;
 };
 
 WebInspector.ClassesPaneWidget.ClassNamePrompt.prototype = {
     /**
      * @param {!WebInspector.DOMNode} selectedNode
      * @return {!Promise.<!Array.<string>>}
@@ skipping 42 matching lines @@
         this._classNamesPromise.then(completions => {
             if (prefix[0] === ".")
                 completions = completions.map(value => "." + value);
             var results = completions.filter(value => value.startsWith(prefix));
             completionsReadyCallback(results, 0);
         });
     },
 
     __proto__: WebInspector.TextPrompt.prototype
 };