Exclude ProxyAuthOnUserBoardScreenTest.ProxyAuthDialogOnUserBoardScreen/1 under MSan

chrome/browser/chromeos/login/proxy_auth_dialog_browsertest.cc

Index: chrome/browser/chromeos/login/proxy_auth_dialog_browsertest.cc
diff --git a/chrome/browser/chromeos/login/proxy_auth_dialog_browsertest.cc b/chrome/browser/chromeos/login/proxy_auth_dialog_browsertest.cc
index efdf11792c8f314e91dc5020c696bda2371fa3b4..5fc1fc1d428a9febbbe9f817fdb8f3c52134ecfa 100644
--- a/chrome/browser/chromeos/login/proxy_auth_dialog_browsertest.cc
+++ b/chrome/browser/chromeos/login/proxy_auth_dialog_browsertest.cc
@@ -128,6 +128,11 @@ IN_PROC_BROWSER_TEST_P(ProxyAuthOnUserBoardScreenTest,
 
 INSTANTIATE_TEST_CASE_P(ProxyAuthOnUserBoardScreenTestSuite,
                         ProxyAuthOnUserBoardScreenTest,
+// Times out under MSan: https://crbug.com/481651
+#if defined(MEMORY_SANITIZER)
+                        testing::Values(false));
+#else
                         testing::Bool());
+#endif
 
 }  // namespace chromeos