[Flaky] Mark OobeInteractiveUITest.SimpleEndToEnd flaky on MSan

The tests were reenabled in https://crrev.com/c/1362814 but started to
flake again. Probably for a different reason but the tests have changed
a lot since, so disabling is easier wrt conflicts and keeps any
possible improvements.

TBR=achuith@chromium.org

Bug: 891484, 891277
Change-Id: Id046f7bf0558dcd98c4e0c06dc71049feb938a3d
Reviewed-on: https://chromium-review.googlesource.com/c/1373822Reviewed-by: Friedrich Horschig [CET] <fhorschig@chromium.org>
Commit-Queue: Friedrich Horschig [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615894}

chrome/browser/chromeos/login/oobe_interactive_ui_test.cc

@@ -501,7 +501,14 @@ void OobeInteractiveUITest::SimpleEndToEnd() {
   WaitForLoginDisplayHostShutdown();
 }
 
-IN_PROC_BROWSER_TEST_P(OobeInteractiveUITest, SimpleEndToEnd) {
+// Flaky on MSAN/ASAN/LSAN: crbug.com/891277, crbug.com/891484.
+#if defined(MEMORY_SANITIZER) || defined(LEAK_SANITIZER) || \
+    defined(ADDRESS_SANITIZER)
+#define MAYBE_SimpleEndToEnd DISABLED_SimpleEndToEnd
+#else
+#define MAYBE_SimpleEndToEnd SimpleEndToEnd
+#endif
+IN_PROC_BROWSER_TEST_P(OobeInteractiveUITest, MAYBE_SimpleEndToEnd) {
   SimpleEndToEnd();
 }