Wire sync shutdown reason from PSS all the way down to sync manager.

sync/internal_api/sync_backup_manager_unittest.cc

Index: sync/internal_api/sync_backup_manager_unittest.cc
diff --git a/sync/internal_api/sync_backup_manager_unittest.cc b/sync/internal_api/sync_backup_manager_unittest.cc
index c0753540c1d3a176e3666aa222891791fcac9b3c..f197ece7ca82a8f714327560c392ebb8e19c9ac3 100644
--- a/sync/internal_api/sync_backup_manager_unittest.cc
+++ b/sync/internal_api/sync_backup_manager_unittest.cc
@@ -97,7 +97,7 @@ class SyncBackupManagerTest : public syncer::SyncManager::Observer,
                      base::Bind(&SyncBackupManagerTest::ConfigureSyncer,
                                 base::Unretained(this)));
     } else {
-      manager_->ShutdownOnSyncThread();
+      manager_->ShutdownOnSyncThread(STOP_SYNC);
     }
   }
 
@@ -133,7 +133,7 @@ TEST_F(SyncBackupManagerTest, NormalizeAndPersist) {
     EXPECT_TRUE(pref.GetEntry()->GetId().ServerKnows());
     EXPECT_FALSE(pref.GetEntry()->GetIsUnsynced());
   }
-  manager->ShutdownOnSyncThread();
+  manager->ShutdownOnSyncThread(STOP_SYNC);
 
   // Reopen db to verify entry is persisted.
   manager.reset(new SyncBackupManager);