Prevent premature 'scan-completed' events in local search.

chrome/browser/resources/file_manager/js/directory_contents.js

 // Copyright (c) 2012 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
  * @param {MetadataCache} metadataCache Metadata cache service.
  * @param {cr.ui.ArrayDataModel} fileList The file list.
  * @param {boolean} showHidden If files starting with '.' are shown.
  */
@@ skipping 515 matching lines @@
   };
 
   var getNextChunk = function() {
     reader.readEntries(onChunkComplete, self.onError.bind(self));
   };
 
   getNextChunk();
 };
 
 /**
- * Empty.
+ * We get results for each directory in one go in scanDirectory_.
  */
 DirectoryContentsLocalSearch.prototype.readNextChunk = function() {
-  this.onCompleted();
 };