[Sheriff] Disable MediaSessionBrowserTest.MultiplePlayersPlayPause on CrOs

TBR=mlamouri@chromium.org

Bug: 1157239
Change-Id: I94f5aef90870471863c37003f9cd06988645502c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627271Reviewed-by: Maxim Kolosovskiy  <kolos@chromium.org>
Commit-Queue: Maxim Kolosovskiy  <kolos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842991}

content/browser/media/session/media_session_browsertest.cc

@@ -249,7 +249,8 @@ IN_PROC_BROWSER_TEST_F(MediaSessionBrowserTestWithoutInternalMediaSession,
 
 // Flaky on Linux and Android and Mac. http://crbug.com/1157239,
 // http://crbug.com/1157319
-#if defined(OS_LINUX) || defined(OS_ANDROID) || defined(OS_MAC)
+#if defined(OS_LINUX) || defined(OS_ANDROID) || defined(OS_MAC) || \
+    defined(OS_CHROMEOS)
 #define MAYBE_SimplePlayPause DISABLED_SimplePlayPause
 #else
 #define MAYBE_SimplePlayPause SimplePlayPause