Disable flaky SingleClientDirectorySyncTest.DeleteDirectoryWhenCorrupted on CrOS

TBR=mastiz

Bug: 850980
Change-Id: I34f162e61a6bbcab7eb702132c6a55cedfae927b
Reviewed-on: https://chromium-review.googlesource.com/1101696Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567590}

chrome/browser/sync/test/integration/single_client_directory_sync_test.cc

@@ -101,8 +101,14 @@ IN_PROC_BROWSER_TEST_F(SingleClientDirectorySyncTest,
 
 // Verify that when the sync directory's backing store becomes corrupted, we
 // trigger an unrecoverable error and delete the database.
+// Flaky on ChromeOS, https://crbug.com/850980.
+#if defined(OS_CHROMEOS)
+#define MAYBE_DeleteDirectoryWhenCorrupted DISABLED_DeleteDirectoryWhenCorrupted
+#else
+#define MAYBE_DeleteDirectoryWhenCorrupted DeleteDirectoryWhenCorrupted
+#endif
 IN_PROC_BROWSER_TEST_F(SingleClientDirectorySyncTest,
-                       DeleteDirectoryWhenCorrupted) {
+                       MAYBE_DeleteDirectoryWhenCorrupted) {
   ASSERT_TRUE(SetupClients()) << "SetupClients() failed.";
   // Sync and wait for syncing to complete.
   ASSERT_TRUE(SetupSync()) << "SetupSync() failed.";