[filemanager] Implementing undo delete functionality.

chrome/browser/resources/file_manager/js/file_manager_pyauto.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.
 
 /**
  * pyautoAPI object provides a set of functions used by PyAuto tests
  * to drive the file manager.
  *
  * Refer to chrome/test/functional/chromeos_file_browser.py for examples
  * of how this API is used.
@@ skipping 130 matching lines @@
   renameItem: function(name) {
     var entry = fileManager.selection.entries[0];
     fileManager.directoryModel_.renameEntry(entry, name, this.sendDone_,
         this.sendDone_);
   },
 
   /**
    * Delete selected entries.
    */
   deleteItems: function() {
-    var entries = fileManager.selection.entries;
-    fileManager.deleteEntries(entries, true, this.sendDone_);
+    var dm = fileManager.directoryModel_;
+    var onRescan = function() {
+      dm.removeEventListener('rescan-completed', onRescan);
+      this.sendDone_();
+    }.bind(this);
+
+    dm.addEventListener('rescan-completed', onRescan);
+    fileManager.deleteSelection();
   },
 
   /**
    * Create directory.
    *
    * @param {string} name Name of the directory.
    */
   createDirectory: function(name) {
     var dm = fileManager.directoryModel_;
     var onRescan = function() {
@@ skipping 77 matching lines @@
     window.domAutomationController.send(JSON.stringify(value));
   },
 
   /**
    * Callback function signalling completion of operation.
    */
   sendDone_: function() {
     window.domAutomationController.send('done');
   }
 };