sync: Gracefully handle very early shutdown

sync/internal_api/test/test_internal_components_factory.cc

Index: sync/internal_api/test/test_internal_components_factory.cc
diff --git a/sync/internal_api/test/test_internal_components_factory.cc b/sync/internal_api/test/test_internal_components_factory.cc
index 03d2d82fe8088a7b10c9b5e00b1aff857631f2be..1493e36adbc49048b3aae30520dda803be883509 100644
--- a/sync/internal_api/test/test_internal_components_factory.cc
+++ b/sync/internal_api/test/test_internal_components_factory.cc
@@ -22,7 +22,9 @@ TestInternalComponentsFactory::TestInternalComponentsFactory(
 TestInternalComponentsFactory::~TestInternalComponentsFactory() { }
 
 scoped_ptr<SyncScheduler> TestInternalComponentsFactory::BuildScheduler(
-    const std::string& name, sessions::SyncSessionContext* context) {
+    const std::string& name,
+    sessions::SyncSessionContext* context,
+    syncer::CancelationSignal* cancelation_signal) {
   return scoped_ptr<SyncScheduler>(new FakeSyncScheduler());
 }