sync: Gracefully handle very early shutdown

sync/internal_api/test/fake_sync_manager.cc

Index: sync/internal_api/test/fake_sync_manager.cc
diff --git a/sync/internal_api/test/fake_sync_manager.cc b/sync/internal_api/test/fake_sync_manager.cc
index cac310b702ffa42f69b05ae217ff2b8c0e82b616..362b74e1ead2c01e2e90d561b715e3cb4373252e 100644
--- a/sync/internal_api/test/fake_sync_manager.cc
+++ b/sync/internal_api/test/fake_sync_manager.cc
@@ -91,7 +91,8 @@ void FakeSyncManager::Init(
     Encryptor* encryptor,
     scoped_ptr<UnrecoverableErrorHandler> unrecoverable_error_handler,
     ReportUnrecoverableErrorFunction report_unrecoverable_error_function,
-    bool use_oauth2_token) {
+    bool use_oauth2_token,
+    CancelationSignal* cancelation_signal) {
   sync_task_runner_ = base::ThreadTaskRunnerHandle::Get();
   PurgePartiallySyncedTypes();
 
@@ -209,9 +210,6 @@ void FakeSyncManager::SaveChanges() {
   // Do nothing.
 }
 
-void FakeSyncManager::StopSyncingForShutdown() {
-}
-
 void FakeSyncManager::ShutdownOnSyncThread() {
   DCHECK(sync_task_runner_->RunsTasksOnCurrentThread());
   test_user_share_.TearDown();