Disable flaky OpenAudioFiles/FilesAppBrowserTest.Test/audioOpenDownloads on Linux ChromiumOS MSan.

TBR=noel@chromium.org

Bug: 859008
Change-Id: Icb0689a7390ea62ee5904e9b91d0efee8a478ce6
Reviewed-on: https://chromium-review.googlesource.com/1120026Reviewed-by: Henrik Grunell <grunell@chromium.org>
Commit-Queue: Henrik Grunell <grunell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571443}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -154,8 +154,11 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
     ::testing::Values(TestCase("audioOpenCloseDownloads"),
                       TestCase("audioOpenCloseDownloads").InGuestMode(),
                       TestCase("audioOpenCloseDrive"),
+// Flaky on Linux ChromiumOS MSan. http://crbug.com/859008.
+#if !(defined(OS_CHROMEOS) && defined(MEMORY_SANITIZER))
                       TestCase("audioOpenDownloads").InGuestMode(),
                       TestCase("audioOpenDownloads"),
+#endif
                       TestCase("audioOpenDrive"),
                       TestCase("audioAutoAdvanceDrive"),
                       TestCase("audioRepeatAllModeSingleFileDrive"),