Disable flaky BrowserCloseManagerWithBackgroundModeBrowserTest.CloseSingleBrowserWithBackgroundMode

Example of failed run: https://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20Tests%20%28sandboxed%29/builds/23742

See bug for more details.
[email protected]
BUG=591806

Review URL: https://codereview.chromium.org/1758233003

Cr-Commit-Position: refs/heads/master@{#379136}
diff --git a/chrome/browser/lifetime/browser_close_manager_browsertest.cc b/chrome/browser/lifetime/browser_close_manager_browsertest.cc
index 4a185b3..38b0571b 100644
--- a/chrome/browser/lifetime/browser_close_manager_browsertest.cc
+++ b/chrome/browser/lifetime/browser_close_manager_browsertest.cc
@@ -1002,7 +1002,7 @@
 // Check that closing the last browser window individually does not affect
 // background mode.
 IN_PROC_BROWSER_TEST_P(BrowserCloseManagerWithBackgroundModeBrowserTest,
-                       CloseSingleBrowserWithBackgroundMode) {
+                       DISABLED_CloseSingleBrowserWithBackgroundMode) {
   RepeatedNotificationObserver close_observer(
       chrome::NOTIFICATION_BROWSER_CLOSED, 1);
   EXPECT_FALSE(IsBackgroundModeSuspended());