[Sheriff] Disable TabManagerTest.DiscardTabsWithOccludedWindow

Flake portal:
https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyTgsSBUZsYWtlIkNjaHJvbWl1bUBicm93c2VyX3Rlc3RzQFRhYk1hbmFnZXJUZXN0LkRpc2NhcmRUYWJzV2l0aE9jY2x1ZGVkV2luZG93DA

TBR=fdoray@chromium.org

Bug: 1106485
Change-Id: Iee3f1a06c3819e0bdb29e89d38534913d80761a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303769Reviewed-by: Sahel Sharify <sahel@chromium.org>
Commit-Queue: Sahel Sharify <sahel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789245}

chrome/browser/resource_coordinator/tab_manager_browsertest.cc

@@ -999,7 +999,8 @@ IN_PROC_BROWSER_TEST_F(TabManagerTest, MAYBE_DiscardTabsWithMinimizedWindow) {
 #define MAYBE_DiscardTabsWithOccludedWindow \
   DISABLED_DiscardTabsWithOccludedWindow
 #else
-#define MAYBE_DiscardTabsWithOccludedWindow DiscardTabsWithOccludedWindow
+// TODO(https://crbug.com/1106485): The test is flaky on release builds.
+#define MAYBE_DiscardTabsWithOccludedWindow DISABLED_DiscardTabsWithOccludedWindow
 #endif
 IN_PROC_BROWSER_TEST_F(TabManagerTest, MAYBE_DiscardTabsWithOccludedWindow) {
   // Occluded browser.