Show the message 'No files match "abc"' if the search results are empty.

chrome/browser/resources/file_manager/js/mock_chrome.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.
 
 function MockEventSource() {
   this.listeners_ = [];
 }
 
 /**
  * Add a listener. There is no remove.
@@ skipping 594 matching lines @@
       HTML_DOCUMENT_FILE_TYPE: 'HTML document',
       ZIP_ARCHIVE_FILE_TYPE: 'Zip archive',
       RAR_ARCHIVE_FILE_TYPE: 'RAR archive',
       TAR_ARCHIVE_FILE_TYPE: 'Tar archive',
       TAR_BZIP2_ARCHIVE_FILE_TYPE: 'Bzip2 compressed tar archive',
       TAR_GZIP_ARCHIVE_FILE_TYPE: 'Gzip compressed tar archive',
       PLAIN_TEXT_FILE_TYPE: 'Plain text file',
       PDF_DOCUMENT_FILE_TYPE: 'PDF document',
       WORD_DOCUMENT_FILE_TYPE: 'Word document',
       POWERPOINT_PRESENTATION_FILE_TYPE: 'PowerPoint presentation',
-      EXCEL_FILE_TYPE: 'Excel spreadsheet'
+      EXCEL_FILE_TYPE: 'Excel spreadsheet',
+
+      SEARCH_NO_MATCHING_FILES: 'No files match <b>"$1"</b>'
     });
   }
 };
 
 /**
  * Mock object for |chrome.extension|.
  */
 chrome.extension = {
   /**
    * @param {string} path Extension-relative path.
@@ skipping 88 matching lines @@
 
   setWindowHeight: function(height) {
     this.popup_.style.height = height + 'px';
   },
 
   closeWindow: function() {
     this.popup_.parentNode.removeChild(this.popup_);
     this.popup_ = null;
   }
 };