[Sync] Sanity test for UserEvents.

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

Index: chrome/browser/sync/test/integration/migration_test.cc
diff --git a/chrome/browser/sync/test/integration/migration_test.cc b/chrome/browser/sync/test/integration/migration_test.cc
index 848b93b6853c1cd32e5e6ba04d5432e2f0cf37b2..3930e733901364e7e6dc43482f6201943e2d4e6c 100644
--- a/chrome/browser/sync/test/integration/migration_test.cc
+++ b/chrome/browser/sync/test/integration/migration_test.cc
@@ -112,6 +112,9 @@ class MigrationTest : public SyncTest  {
     // that it be migrated.
     preferred_data_types.Remove(syncer::ARC_PACKAGE);
 
+    // Doesn't make sense to migrate commit only types.
+    preferred_data_types.RemoveAll(syncer::CommitOnlyTypes());
+
     // Make sure all clients have the same preferred data types.
     for (int i = 1; i < num_clients(); ++i) {
       const syncer::ModelTypeSet other_preferred_data_types =