Re-implement cancellation of copyFileEntry_().

chrome/browser/resources/file_manager/js/util.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.
 
 'use strict';
 
 /**
  * Namespace for utility functions.
  */
 var util = {};
@@ skipping 487 matching lines @@
     // Found a path that doesn't exist.
     onSuccess(trialPath);
   }
 
   var numRetry = MAX_RETRY;
   var onResolved = function(entry) {
     if (--numRetry == 0) {
       // Hit the limit of the number of retrial.
       // Note that we cannot create FileError object directly, so here we use
       // Object.create instead.
-      onError(Object.create(FileError.prototype, {
-        code: {
-          get: function() { return FileError.PATH_EXISTS_ERR; }
-        }
-      }));
+      onError(util.createFileError(FileError.PATH_EXISTS_ERR));
       return;
     }
 
     ++copyNumber;
     trialPath = prefix + ' (' + copyNumber + ')' + ext;
     util.resolvePath(dirEntry, trialPath, onResolved, onNotResolved);
   };
 
   // Check to see if the target exists.
   util.resolvePath(dirEntry, trialPath, onResolved, onNotResolved);
@@ skipping 637 matching lines @@
 };
 
 /**
  * @param {DirectoryEntry|Object} entry DirectoryEntry to be checked.
  * @return {boolean} True if the given entry is fake.
  */
 util.isFakeDirectoryEntry = function(entry) {
   // Currently, fake entry doesn't support createReader.
   return !('createReader' in entry);
 };
+
+/**
+ * Creates a FileError instance with given code.
+ * Note that we cannot create FileError instance by "new FileError(code)",
+ * unfortunately, so here we use Object.create.
+ * @param {number} code Error code for the FileError.
+ * @return {FileError} FileError instance
+ */
+util.createFileError = function(code) {
+  return Object.create(FileError.prototype, {
+    code: { get: function() { return code; } }
+  });
+};