Re-enable file browser tests on chromeos

chrome/test/functional/PYAUTO_TESTS

 # 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.
 #
 # This file lists the pyauto tests that run as a part of the functional test
 # suite.
 #
 # Tests can be enabled on a per-platform basis. Tests not listed here will
 # not be run.
 #
@@ skipping 274 matching lines @@
       # this platform.
       '-policy',
       '-policy_prefs_ui',
 
       # ==================================================
       # Disabled tests that need to be investigated/fixed.
       # ==================================================
       # crosbug.com/19556
       '-autofill.AutofillTest.testDisplayLineItemForEntriesWithNoCCNum',
       '-autofill.AutofillTest.testPostalCodeAndStateLabelsBasedOnCountry',
-      # FileBrowser test API as broken - crosbug.com/24257
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testCopyFolderInDialog',
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testCopyFolderInFullPage',
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testCreateFolderInDialog',
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testCreateFolderInFullPage',
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testCutFolderInDialog',
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testCutFolderInFullPage',
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testDeleteFolderInDialog',
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testDeleteFolderInFullPage',
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testGetSelectedDirectorySizeStats',
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testRenameFolderInDialog',
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testRenameFolderInFullPage',
-      '-chromeos_file_browser.ChromeosFileBrowserTest.testSelectMultipleFoldersInFullPage',
       # Downloads panel stays even after declining a download.
       # crosbug.com/14728
       '-downloads.DownloadsTest.testDeclineDangerousDownload',
       # crosbug.com/19556
       '-extensions.ExtensionsTest.testAllowAccessFileURLs',
       '-extensions.ExtensionsTest.testAllowIncognitoExtension',
       '-extensions.ExtensionsTest.testDisableEnableExtension',
       # Need internal data dirs in autotest package. crosbug.com/6855
       '-find_in_page.FindMatchTests.testSearchInPDF',
       # crosbug.com/24496
@@ skipping 315 matching lines @@
     ],
   },
 
   # HTML5 media performance tests.
   'AV_PERF': {
      'linux': [
        'media.media_constrained_network_perf',
      ],
   },
 }