[filemanager] Implementing undo delete functionality.

chrome/browser/resources/file_manager/js/directory_model.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.
 
 // If directory files changes too often, don't rescan directory more than once
 // per specified interval
 var SIMULTANEOUS_RESCAN_INTERVAL = 1000;
 // Used for operations that require almost instant rescan.
 var SHORT_RESCAN_INTERVAL = 100;
 
@@ skipping 478 matching lines @@
   dirContents.replaceContextFileList();
 
   this.setSelectedPaths_(selectedPaths);
   this.fileListSelection_.leadIndex = leadIndex;
   this.setLeadPath_(leadPath);
   this.fileListSelection_.endChange();
   cr.dispatchSimpleEvent(this, 'end-update-files');
 };
 
 /**
- * Delete the list of files and directories from filesystem and
- * update the file list.
- * @param {Array.<Entry>} entries Entries to delete.
- * @param {function()=} opt_callback Called when finished.
- */
-DirectoryModel.prototype.deleteEntries = function(entries, opt_callback) {
-  var downcount = entries.length + 1;
-  var currentDirPath = this.getCurrentDirPath();
-
-  var onComplete = opt_callback ? function() {
-    if (--downcount == 0)
-      opt_callback();
-  } : function() {};
-
-  var fileList = this.getFileList();
-  for (var i = 0; i < entries.length; i++) {
-    var entry = entries[i];
-
-    var onSuccess = function(removedEntry) {
-      if (currentDirPath == this.getCurrentDirPath()) {
-        var index = fileList.indexOf(removedEntry);
-        if (index >= 0)
-          fileList.splice(index, 1);
-      }
-      onComplete();
-    }.bind(this, entry);
-
-    util.removeFileOrDirectory(
-        entry,
-        onSuccess,
-        util.flog('Error deleting ' + entry.fullPath, onComplete));
-  }
-  onComplete();
-};
-
-/**
  * @param {string} name Filename.
  */
 DirectoryModel.prototype.onEntryChanged = function(name) {
   var currentEntry = this.getCurrentDirEntry();
   var fileList = this.getFileList();
   var self = this;
 
   function onEntryFound(entry) {
     // Do nothing if current directory changed during async operations.
     if (self.getCurrentDirEntry() != currentEntry)
@@ skipping 808 matching lines @@
         }.bind(this));
   }
 };
 
 /**
  * @return {DirectoryEntry} Current watched directory entry.
  */
 FileWatcher.prototype.getWatchedDirectoryEntry = function() {
   return this.watchedDirectoryEntry_;
 };