Disable TabindexOpenDialog_FileManagerBrowserTest tests on official build.

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 1114 matching lines @@
   DISABLED_TabindexFocusDirectorySelected
 #else
 #define MAYBE_TabindexFocusDirectorySelected TabindexFocusDirectorySelected
 #endif
 WRAPPED_INSTANTIATE_TEST_CASE_P(
     MAYBE_TabindexFocusDirectorySelected,
     FileManagerBrowserTest,
     ::testing::Values(TestParameter(NOT_IN_GUEST_MODE,
                                     "tabindexFocusDirectorySelected")));
 
+// Fails on official cros trunk build. http://crbug.com/480491
+#if defined(OFFICIAL_BUILD)
+#define MAYBE_TabindexOpenDialog DISABLED_TabindexOpenDialog
+#else
+#define MAYBE_TabindexOpenDialog TabindexOpenDialog
+#endif
 INSTANTIATE_TEST_CASE_P(
-    TabindexOpenDialog,
+    MAYBE_TabindexOpenDialog,
     FileManagerBrowserTest,
     ::testing::Values(
         TestParameter(NOT_IN_GUEST_MODE, "tabindexOpenDialogDrive"),
         TestParameter(NOT_IN_GUEST_MODE, "tabindexOpenDialogDownloads"),
         TestParameter(IN_GUEST_MODE, "tabindexOpenDialogDownloads")));
 
 // Fails on official build. http://crbug.com/482121.
 #if defined(OFFICIAL_BUILD)
 #define MAYBE_TabindexSaveFileDialog DISABLED_TabindexSaveFileDialog
 #else
@@ skipping 393 matching lines @@
   StartTest();
 }
 
 IN_PROC_BROWSER_TEST_F(VideoPlayerBrowserTest, OpenSingleVideoOnDrive) {
   set_test_case_name("openSingleVideoOnDrive");
   StartTest();
 }
 
 }  // namespace
 }  // namespace file_manager