Pass args to SyncManager::Init via a struct.

sync/internal_api/sync_rollback_manager.cc

Index: sync/internal_api/sync_rollback_manager.cc
diff --git a/sync/internal_api/sync_rollback_manager.cc b/sync/internal_api/sync_rollback_manager.cc
index a26e54ec38a0db2907cd726a73b0d6e637a518f1..a422f73085cb694442ab7a81f45a2e61c2c7851b 100644
--- a/sync/internal_api/sync_rollback_manager.cc
+++ b/sync/internal_api/sync_rollback_manager.cc
@@ -22,34 +22,18 @@ SyncRollbackManager::SyncRollbackManager()
 SyncRollbackManager::~SyncRollbackManager() {
 }
 
-void SyncRollbackManager::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,
-    SyncManager::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 SyncRollbackManager::Init(InitArgs* args) {
   if (SyncRollbackManagerBase::InitInternal(
-          database_location,
-          internal_components_factory,
-          unrecoverable_error_handler.Pass(),
-          report_unrecoverable_error_function)) {
-    change_delegate_ = change_delegate;
-
-    for (size_t i = 0; i < workers.size(); ++i) {
-      ModelSafeGroup group = workers[i]->GetModelSafeGroup();
+          args->database_location,
+          args->internal_components_factory,
+          args->unrecoverable_error_handler.Pass(),
+          args->report_unrecoverable_error_function)) {
+    change_delegate_ = args->change_delegate;
+
+    for (size_t i = 0; i < args->workers.size(); ++i) {
+      ModelSafeGroup group = args->workers[i]->GetModelSafeGroup();
       CHECK(workers_.find(group) == workers_.end());
-      workers_[group] = workers[i];
+      workers_[group] = args->workers[i];
     }
 
     rollback_ready_types_ = GetUserShare()->directory->InitialSyncEndedTypes();