Disable flaky X11TopmostWindowFinderTest.Menu

R=sky

Bug: 955316
Change-Id: I24701fa5e7c51d2469f980acafbe61a1e078818e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335477
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794253}

ui/views/widget/desktop_aura/x11_topmost_window_finder_interactive_uitest.cc

@@ -376,7 +376,9 @@ TEST_F(X11TopmostWindowFinderTest, NonRectangularNullShape) {
 
 // Test that the TopmostWindowFinder finds windows which belong to menus
 // (which may or may not belong to Chrome).
-TEST_F(X11TopmostWindowFinderTest, Menu) {
+//
+// Flakes (https://crbug.com/955316)
+TEST_F(X11TopmostWindowFinderTest, DISABLED_Menu) {
   x11::Window window = CreateAndShowXWindow(gfx::Rect(100, 100, 100, 100));
 
   x11::Window root = ui::GetX11RootWindow();