[fsp] Pass more detailed errors to the providing extension.

chrome/test/data/extensions/api_test/file_system_provider/unmount/test.js

 // Copyright 2014 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';
 
 /**
  * @type {string}
  * @const
  */
@@ skipping 52 matching lines @@
       chrome.fileSystemProvider.unmount(
           {fileSystemId: FIRST_FILE_SYSTEM_ID},
           chrome.test.callbackPass());
     },
 
     // Tests the fileSystemProvider.unmount() with a wrong id. Verifies that
     // it fails with a correct error code.
     function unmountWrongId() {
       chrome.fileSystemProvider.unmount(
           {fileSystemId: 'wrong-fs-id'},
-          chrome.test.callbackFail('SECURITY'));
+          chrome.test.callbackFail('NOT_FOUND'));
     },
 
     // Tests if fileManagerPrivate.removeMount() for provided file systems emits
     // the onMountRequested() event with correct arguments.
     function requestUnmountSuccess() {
       var onUnmountRequested = chrome.test.callbackPass(
           function(options, onSuccess, onError) {
         chrome.test.assertEq(SECOND_FILE_SYSTEM_ID, options.fileSystemId);
         // Not calling fileSystemProvider.unmount(), so the onMountCompleted
         // event will not be raised.
@@ skipping 49 matching lines @@
       test_util.getVolumeInfo(SECOND_FILE_SYSTEM_ID, function(volumeInfo) {
         chrome.test.assertTrue(!!volumeInfo);
         chrome.fileManagerPrivate.removeMount(volumeInfo.volumeId);
       });
     }
   ]);
 }
 
 // Setup and run all of the test cases.
 setUp(runTests);