Disable two (unrelated) flaky tests on win

chrome/browser/extensions/api/messaging/native_message_process_host_unittest.cc

Index: chrome/browser/extensions/api/messaging/native_message_process_host_unittest.cc
diff --git a/chrome/browser/extensions/api/messaging/native_message_process_host_unittest.cc b/chrome/browser/extensions/api/messaging/native_message_process_host_unittest.cc
index 4d8cf88d382390493b88d5341264f358044a29cd..28c31feb1023f7ff088b85f41f28c1adf76406dd 100644
--- a/chrome/browser/extensions/api/messaging/native_message_process_host_unittest.cc
+++ b/chrome/browser/extensions/api/messaging/native_message_process_host_unittest.cc
@@ -303,7 +303,13 @@ TEST_F(NativeMessagingTest, EchoConnect) {
   EXPECT_EQ(expected_url, url);
 }
 
-TEST_F(NativeMessagingTest, UserLevel) {
+// http://crbug.com/723291
+#if defined(OS_WIN)
+#define MAYBE_UserLevel DISABLED_UserLevel
+#else
+#define MAYBE_UserLevel UserLevel
+#endif
+TEST_F(NativeMessagingTest, MAYBE_UserLevel) {
   ScopedTestNativeMessagingHost test_host;
   ASSERT_NO_FATAL_FAILURE(test_host.RegisterTestHost(true));