Revert "Re-enable OpenAudioFiles/FileManagerBrowserTest"

This reverts commit 738768f5.

Reason for revert: Times out on MSAN

https://ci.chromium.org/buildbot/chromium.memory/Linux%20ChromiumOS%20MSan%20Tests/7143

Original change's description:
> Re-enable OpenAudioFiles/FileManagerBrowserTest
> 
> Enabled in RELEASE, now re-enable this test in DEBUG/MSAN/ASAN.
> 
> Bug: 836254
> Change-Id: Ie6ca28f923dcf70be407c8782985195874f47758
> Reviewed-on: https://chromium-review.googlesource.com/1056748
> Reviewed-by: Stuart Langley <slangley@chromium.org>
> Commit-Queue: Noel Gordon <noel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#558168}

TBR=noel@chromium.org,fukino@chromium.org,slangley@chromium.org

Change-Id: Ib066688090f770c251b333db4446d92f52951a0e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 836254
Reviewed-on: https://chromium-review.googlesource.com/1056657Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558220}

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

@@ -113,8 +113,14 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
                       TestParameter(NOT_IN_GUEST_MODE, "videoOpenDownloads"),
                       TestParameter(NOT_IN_GUEST_MODE, "videoOpenDrive")));
 
+// Fails on official build. http://crbug.com/429294
+#if defined(DISABLE_SLOW_FILESAPP_TESTS) || defined(OFFICIAL_BUILD)
+#define MAYBE_OpenAudioFiles DISABLED_OpenAudioFiles
+#else
+#define MAYBE_OpenAudioFiles OpenAudioFiles
+#endif
 WRAPPED_INSTANTIATE_TEST_CASE_P(
-    OpenAudioFiles,
+    MAYBE_OpenAudioFiles,
     FileManagerBrowserTest,
     ::testing::Values(
         TestParameter(IN_GUEST_MODE, "audioOpenDownloads"),