Disabling MachineLevelUserCloudPolicyEnrollmentTest.Test on Win dbg.

BUG=984902
TBR=zmin@chromium.org

Change-Id: Ifa70f9f3490853b9f91ffab6f674356758e003fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1705796Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678229}

chrome/browser/policy/cloud/machine_level_user_cloud_policy_browsertest.cc

@@ -506,7 +506,13 @@ class MachineLevelUserCloudPolicyEnrollmentTest
   DISALLOW_COPY_AND_ASSIGN(MachineLevelUserCloudPolicyEnrollmentTest);
 };
 
-IN_PROC_BROWSER_TEST_P(MachineLevelUserCloudPolicyEnrollmentTest, Test) {
+// Disabled on Windows dbg due to failures; see https://crbug.com/984902.
+#if defined(OS_WIN) && !defined(NDEBUG)
+#define MAYBE_Test DISABLED_Test
+#else
+#define MAYBE_Test Test
+#endif
+IN_PROC_BROWSER_TEST_P(MachineLevelUserCloudPolicyEnrollmentTest, MAYBE_Test) {
   // Test body is run only if enrollment is succeeded or failed without error
   // message.
   EXPECT_TRUE(is_enrollment_token_valid() || !should_display_error_message());