[sheriff] Disable NextTrackButtonVisibility on Linux

The test is failing flakily

TBR=mlamouri@chromium.org
Bug: 1167236

Change-Id: I9091e1fa70540e2967c71c8cdd22a2aec343c8f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632806Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Yi Gu <yigu@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Auto-Submit: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844158}

chrome/browser/picture_in_picture/picture_in_picture_window_controller_browsertest.cc

@@ -1953,8 +1953,14 @@ IN_PROC_BROWSER_TEST_F(MediaSessionPictureInPictureWindowControllerBrowserTest,
 
 // Tests that a Next Track button is displayed in the Picture-in-Picture window
 // when Media Session Action "nexttrack" is handled by the website.
+// TODO(crbug.com/1167236): Flaky on Linux.
+#if defined(OS_LINUX)
+#define MAYBE_NextTrackButtonVisibility DISABLED_NextTrackButtonVisibility
+#else
+#define MAYBE_NextTrackButtonVisibility NextTrackButtonVisibility
+#endif
 IN_PROC_BROWSER_TEST_F(MediaSessionPictureInPictureWindowControllerBrowserTest,
-                       NextTrackButtonVisibility) {
+                       MAYBE_NextTrackButtonVisibility) {
   LoadTabAndEnterPictureInPicture(
       browser(), base::FilePath(kPictureInPictureWindowSizePage));
   ASSERT_NE(GetOverlayWindow(), nullptr);