Disable ConstrainedWindowViewTest.FocusTest on Linux

Bug: 1509159
Change-Id: Id71aab47402667cffd4e9dc817a47a260f9f169c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5096460
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Auto-Submit: Alan Screen <awscreen@chromium.org>
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Owners-Override: Alan Screen <awscreen@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1234282}

chrome/browser/ui/views/constrained_window_views_browsertest.cc

@@ -67,8 +67,9 @@ class ConstrainedWindowViewTest : public InProcessBrowserTest {
 
 }  // namespace
 
-#if BUILDFLAG(IS_MAC)
+#if BUILDFLAG(IS_MAC) || BUILDFLAG(IS_LINUX)
 // Unexpected multiple focus managers on MacViews: http://crbug.com/824551
+// TODO(crbug.com/1509159):  Enable for Linux after resolving failure.
 #define MAYBE_FocusTest DISABLED_FocusTest
 #else
 #define MAYBE_FocusTest FocusTest