Disable MachineLevelUserCloudPolicyPolicyFetchTest.Test on windows

MachineLevelUserCloudPolicyPolicyFetchTest.Test is flaky
on all platforms.

TBR=zmin@chromium.org

Bug: 939261
Change-Id: I2e1a6403ffc1b56f753320eceaa26e5fdec0b5fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1509332Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638722}

chrome/browser/policy/cloud/machine_level_user_cloud_policy_browsertest.cc

@@ -626,7 +626,14 @@ class MachineLevelUserCloudPolicyPolicyFetchTest
   DISALLOW_COPY_AND_ASSIGN(MachineLevelUserCloudPolicyPolicyFetchTest);
 };
 
-IN_PROC_BROWSER_TEST_P(MachineLevelUserCloudPolicyPolicyFetchTest, Test) {
+// Crashes on Win only.  http://crbug.com/939261
+#if defined(OS_WIN)
+#define MAYBE_Test DISABLED_Test
+#else
+#define MAYBE_Test Test
+#endif
+
+IN_PROC_BROWSER_TEST_P(MachineLevelUserCloudPolicyPolicyFetchTest, MAYBE_Test) {
   MachineLevelUserCloudPolicyManager* manager =
       g_browser_process->browser_policy_connector()
           ->machine_level_user_cloud_policy_manager();