Sheriff: Disable flaky test...

Sheriff: Disable flaky test MediaRouterUIBrowserTest.EphemeralToolbarIconForDialog on Windows and Linux

TBR=mfoltz@chromium.org
TBR=btolsch@chromium.org
TBR=takumif@chromium.org

Bug: 1004635
Change-Id: Iaacfab10a842b16eebc4ca771626932ec9cb859d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808623Reviewed-by: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#697103}

chrome/browser/ui/views/media_router/media_router_ui_browsertest.cc

@@ -137,8 +137,14 @@ IN_PROC_BROWSER_TEST_F(MediaRouterUIBrowserTest, OpenDialogFromAppMenu) {
   EXPECT_FALSE(dialog_controller->IsShowingMediaRouterDialog());
 }
 
+// TODO(crbug.com/1004635) Disabled due to flake on Windows and Linux
+#if defined(OS_WIN) || defined(OS_LINUX)
+#define MAYBE_EphemeralToolbarIconForDialog EphemeralToolbarIconForDialog
+#else
+#define MAYBE_EphemeralToolbarIconForDialog DISABLED_EphemeralToolbarIconForDialog
+#endif
 IN_PROC_BROWSER_TEST_F(MediaRouterUIBrowserTest,
-                       EphemeralToolbarIconForDialog) {
+                       MAYBE_EphemeralToolbarIconForDialog) {
   MediaRouterDialogController* dialog_controller = GetDialogController();
 
   EXPECT_FALSE(ToolbarIconExists());