Disable flaky test

This test is flaky/failing on MSAN, disabling until is fixed.

TBR: joelhockey@chromium.org
Bug: 899664
Change-Id: I89646e80d9bbb8735d0056c26c882b056b4c9e97
Reviewed-on: https://chromium-review.googlesource.com/c/1308239Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604147}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -276,7 +276,10 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
     FilesAppBrowserTest,
     ::testing::Values(TestCase("selectCreateFolderDownloads").InGuestMode(),
                       TestCase("selectCreateFolderDownloads"),
+// This test is flaky in MSAN, disabling until is fixed: crbug.com/899664.
+#if !defined(MEMORY_SANITIZER)
                       TestCase("createFolderDownloads").InGuestMode(),
+#endif
                       TestCase("createFolderDownloads"),
                       TestCase("createFolderNestedDownloads"),
                       TestCase("createFolderDrive").DisableDriveFs(),