DevTools: fix private field usage violation discovered after the compiler roll.

third_party/WebKit/Source/devtools/front_end/sources/FileBasedSearchResultsPane.js

 // Copyright 2014 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
  */
 Sources.FileBasedSearchResultsPane = class extends Sources.SearchResultsPane {
   /**
    * @param {!Workspace.ProjectSearchConfig} searchConfig
    */
@@ skipping 17 matching lines @@
     var uiSourceCode = searchResult.uiSourceCode;
     if (!uiSourceCode)
       return;
     this._addFileTreeElement(searchResult);
   }
 
   /**
    * @param {!Sources.FileBasedSearchResult} searchResult
    */
   _addFileTreeElement(searchResult) {
-    var fileTreeElement = new Sources.FileBasedSearchResultsPane.FileTreeElement(this._searchConfig, searchResult);
+    var fileTreeElement = new Sources.FileBasedSearchResultsPane.FileTreeElement(this.searchConfig, searchResult);
     this._treeOutline.appendChild(fileTreeElement);
     // Expand until at least a certain number of matches is expanded.
     if (this._matchesExpandedCount < Sources.FileBasedSearchResultsPane.matchesExpandedByDefaultCount)
       fileTreeElement.expand();
     this._matchesExpandedCount += searchResult.searchMatches.length;
   }
 };
 
 Sources.FileBasedSearchResultsPane.matchesExpandedByDefaultCount = 20;
 Sources.FileBasedSearchResultsPane.fileMatchesShownAtOnce = 20;
@@ skipping 159 matching lines @@
   /**
    * @param {number} startMatchIndex
    * @return {boolean}
    */
   _showMoreMatchesElementSelected(startMatchIndex) {
     this.removeChild(this._showMoreMatchesTreeElement);
     this._appendSearchMatches(startMatchIndex, this._searchResult.searchMatches.length);
     return false;
   }
 };