Make the sort order in thumbnail view always alphabetical.

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

 // Copyright (c) 2013 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.
 
 // Browser test for basic Chrome OS file manager functionality:
 //  - The file list is updated when a file is added externally to the Downloads
 //    folder.
 //  - Selecting a file and copy-pasting it with the keyboard copies the file.
 //  - Selecting a file and pressing delete deletes it.
 
@@ skipping 1117 matching lines @@
 #if !defined(NDEBUG)
 #define MAYBE_ShowGridView DISABLED_ShowGridView
 #else
 #define MAYBE_ShowGridView ShowGridView
 #endif
 WRAPPED_INSTANTIATE_TEST_CASE_P(
     MAYBE_ShowGridView,
     FileManagerBrowserTest,
     ::testing::Values(TestParameter(NOT_IN_GUEST_MODE, "showGridViewDownloads"),
                       TestParameter(IN_GUEST_MODE, "showGridViewDownloads"),
-                      TestParameter(NOT_IN_GUEST_MODE, "showGridViewDrive")));
+                      TestParameter(NOT_IN_GUEST_MODE, "showGridViewDrive"),
+                      TestParameter(IN_GUEST_MODE, "checkFilesSorted")));
 
 // Structure to describe an account info.
 struct TestAccountInfo {
   const char* const email;
   const char* const hash;
   const char* const display_name;
 };
 
 enum {
   DUMMY_ACCOUNT_INDEX = 0,
@@ skipping 395 matching lines @@
 }
 
 IN_PROC_BROWSER_TEST_F(VideoPlayerBrowserTest, OpenSingleVideoOnDrive) {
   AddScript("video_player/open_video_files.js");
   set_test_case_name("openSingleVideoOnDrive");
   StartTest();
 }
 
 }  // namespace
 }  // namespace file_manager