Re-enable Tabindex/FileManagerBrowserTest

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

Tbr: fukino
Bug: 836254
Change-Id: Ife1c1ccc84b3d25f469da93d69bd334145b8f4b8
Reviewed-on: https://chromium-review.googlesource.com/1055370
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558116}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -345,13 +345,9 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
     ::testing::Values(TestParameter(NOT_IN_GUEST_MODE, "sortColumns"),
                       TestParameter(IN_GUEST_MODE, "sortColumns")));
 
-#if defined(DISABLE_SLOW_FILESAPP_TESTS)
-#define MAYBE_TabIndex DISABLED_TabIndex
-#else
-#define MAYBE_TabIndex TabIndex
-#endif
+// FIXME: prefix the test name with tabindex
 WRAPPED_INSTANTIATE_TEST_CASE_P(
-    MAYBE_TabIndex,
+    TabIndex,
     FileManagerBrowserTestWithLegacyEventDispatch,
     ::testing::Values(TestParameter(NOT_IN_GUEST_MODE, "searchBoxFocus")));