Disable UserAddingScreenTest.AddingSeveralUsers on ChromeOS MSan

TBR=rsorokin

Bug: 1067461
Change-Id: Ieae7074a542b9addfafc8be773ee4d8343b785a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135613
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756249}

chrome/browser/chromeos/login/ui/user_adding_screen_browsertest.cc

@@ -167,7 +167,8 @@ IN_PROC_BROWSER_TEST_F(UserAddingScreenTest, PRE_AddingSeveralUsers) {
 }
 
 // TODO(crbug.com/1067461): Flakes on ASAN and linux-chromeos-dbg
-#if defined(OS_CHROMEOS) && (defined(ADDRESS_SANITIZER) || !defined(NDEBUG))
+#if defined(OS_CHROMEOS) && (defined(ADDRESS_SANITIZER) || \
+                             defined(MEMORY_SANITIZER) || !defined(NDEBUG))
 #define MAYBE_AddingSeveralUsers DISABLED_AddingSeveralUsers
 #else
 #define MAYBE_AddingSeveralUsers AddingSeveralUsers