Revert "Disable tests on MSAN and ASAN"

This reverts commit 518057ec.

Reason for revert: crrev.com/c/1321649 should fix the flakiness, so let's re-enable these tests.

Original change's description:
> Disable tests on MSAN and ASAN
> 
> These 2 tests are flaky on MSAN and ASAN, disabling it them until they
> get fixed.
> 
> Bug: 899664
> Change-Id: I0ee7b0fd58731f47b03637f21a55f27254ae576b
> Reviewed-on: https://chromium-review.googlesource.com/c/1317210
> Reviewed-by: Noel Gordon <noel@chromium.org>
> Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#605238}

TBR=noel@chromium.org,lucmult@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 899664
Change-Id: Iee08e4d5bf05c09aee00023717f1351b880585b6
Reviewed-on: https://chromium-review.googlesource.com/c/1322009Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605920}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -278,12 +278,9 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
 WRAPPED_INSTANTIATE_TEST_CASE_P(
     CreateNewFolder, /* create_new_folder.js */
     FilesAppBrowserTest,
-    ::testing::Values(TestCase("selectCreateFolderDownloads"),
-// Some GuestMode tests are flaky on MSAN and ASAN, crbug.com/899664
-#if !(defined(MEMORY_SANITIZER) || defined(ADDRESS_SANITIZER))
-                      TestCase("selectCreateFolderDownloads").InGuestMode(),
+    ::testing::Values(TestCase("selectCreateFolderDownloads").InGuestMode(),
+                      TestCase("selectCreateFolderDownloads"),
                       TestCase("createFolderDownloads").InGuestMode(),
-#endif
                       TestCase("createFolderDownloads"),
                       TestCase("createFolderNestedDownloads"),
                       TestCase("createFolderDrive").DisableDriveFs(),