Re-enable TabindexFocusDirectorySelected/FileManagerBrowserTest all bots

Enabled in RELEASE, now re-enable this test in DEBUG/MSAN/ASAN.

Bug: 835626
Change-Id: I404db91904dab92834a7efca5a567b2ad66d84e4
Reviewed-on: https://chromium-review.googlesource.com/1049474Reviewed-by: Naoki Fukino <fukino@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556722}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -384,14 +384,8 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
                                     "tabindexFocusDownloads"),
                       TestParameter(IN_GUEST_MODE, "tabindexFocusDownloads")));
 
-#if defined(DISABLE_SLOW_FILESAPP_TESTS)
-#define MAYBE_TabindexFocusDirectorySelected \
-  DISABLED_TabindexFocusDirectorySelected
-#else
-#define MAYBE_TabindexFocusDirectorySelected TabindexFocusDirectorySelected
-#endif
 WRAPPED_INSTANTIATE_TEST_CASE_P(
-    MAYBE_TabindexFocusDirectorySelected,
+    TabindexFocusDirectorySelected,
     FileManagerBrowserTestWithLegacyEventDispatch,
     ::testing::Values(TestParameter(NOT_IN_GUEST_MODE,
                                     "tabindexFocusDirectorySelected")));