Pass args to SyncManager::Init via a struct.

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 b7e7ba52f2a7dea995450af92c2a250e4b611b73..43b6eb6dc9452a17e51af9f2c91e6f71d3a316ef 100644
--- a/sync/internal_api/test/fake_sync_manager.cc
+++ b/sync/internal_api/test/fake_sync_manager.cc
@@ -72,23 +72,7 @@ void FakeSyncManager::WaitForSyncThread() {
   run_loop.Run();
 }
 
-void FakeSyncManager::Init(
-    const base::FilePath& database_location,
-    const WeakHandle<JsEventHandler>& event_handler,
-    const GURL& service_url,
-    scoped_ptr<HttpPostProviderFactory> post_factory,
-    const std::vector<scoped_refptr<ModelSafeWorker> >& workers,
-    ExtensionsActivity* extensions_activity,
-    ChangeDelegate* change_delegate,
-    const SyncCredentials& credentials,
-    const std::string& invalidator_client_id,
-    const std::string& restored_key_for_bootstrapping,
-    const std::string& restored_keystore_key_for_bootstrapping,
-    InternalComponentsFactory* internal_components_factory,
-    Encryptor* encryptor,
-    scoped_ptr<UnrecoverableErrorHandler> unrecoverable_error_handler,
-    ReportUnrecoverableErrorFunction report_unrecoverable_error_function,
-    CancelationSignal* cancelation_signal) {
+void FakeSyncManager::Init(InitArgs* args) {
   sync_task_runner_ = base::ThreadTaskRunnerHandle::Get();
   PurgePartiallySyncedTypes();