[Sheriff] Disable flaky DumpAccessibilityTreeTest on CrOS MSAN

See linked bug for details.

TBR=aleventhal@chromium.org

Bug: 1167331
Change-Id: I4b9ec1ec4acd90d59765655f18ea7a406962c7b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2633924Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844277}

content/browser/accessibility/dump_accessibility_tree_browsertest.cc

@@ -1017,7 +1017,14 @@ IN_PROC_BROWSER_TEST_P(DumpAccessibilityTreeTest, AccessibilityAriaOwns) {
   RunAriaTest(FILE_PATH_LITERAL("aria-owns.html"));
 }
 
-IN_PROC_BROWSER_TEST_P(DumpAccessibilityTreeTest, AccessibilityAriaOwnsCrash) {
+// Flaky on CrOS MSAN: https://crbug.com/1167331
+#if defined(OS_CHROMEOS) && defined(MEMORY_SANITIZER)
+#define MAYBE_AccessibilityAriaOwnsCrash DISABLED_AccessibilityAriaOwnsCrash
+#else
+#define MAYBE_AccessibilityAriaOwnsCrash AccessibilityAriaOwnsCrash
+#endif
+IN_PROC_BROWSER_TEST_P(DumpAccessibilityTreeTest,
+                       MAYBE_AccessibilityAriaOwnsCrash) {
   RunAriaTest(FILE_PATH_LITERAL("aria-owns-crash.html"));
 }