Mark test as flaky.

BUG=871784
TBR=joenotcharles@chromium.org
NOTRY=true

Change-Id: If114b2364922392b3e9a56c62a47dd45f1101b62
Reviewed-on: https://chromium-review.googlesource.com/1165832Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581332}

chrome/chrome_cleaner/os/system_util_cleaner_unittest.cc

@@ -85,7 +85,7 @@ TEST_F(ServiceUtilCleanerTest, DeleteService) {
 }
 
 // Flaky. https://crbug.com/871784
-TEST_F(ServiceUtilCleanerTest, FLAKY_StopAndDeleteRunningService) {
+TEST_F(ServiceUtilCleanerTest, DISABLED_StopAndDeleteRunningService) {
   // Install and launch the service.
   TestScopedServiceHandle service_handle;
   ASSERT_TRUE(service_handle.InstallService());
@@ -109,7 +109,7 @@ TEST_F(ServiceUtilCleanerTest, FLAKY_StopAndDeleteRunningService) {
 }
 
 // Flaky. https://crbug.com/871784
-TEST_F(ServiceUtilCleanerTest, FLAKY_DeleteRunningService) {
+TEST_F(ServiceUtilCleanerTest, DISABLED_DeleteRunningService) {
   // Install and launch the service.
   TestScopedServiceHandle service_handle;
   ASSERT_TRUE(service_handle.InstallService());