Make SyncBackendRegistrar aware of loaded data

sync/internal_api/sync_manager_impl.h

Index: sync/internal_api/sync_manager_impl.h
diff --git a/sync/internal_api/sync_manager_impl.h b/sync/internal_api/sync_manager_impl.h
index 75f9c337f7a24a5ca0acb78a412fa5c2f3efceaa..f5c2f61ac78a21253a2530ae21def4f71fdca7c9 100644
--- a/sync/internal_api/sync_manager_impl.h
+++ b/sync/internal_api/sync_manager_impl.h
@@ -65,7 +65,6 @@ class SyncManagerImpl : public SyncManager,
       bool use_ssl,
       const scoped_refptr<base::TaskRunner>& blocking_task_runner,
       scoped_ptr<HttpPostProviderFactory> post_factory,
-      const ModelSafeRoutingInfo& model_safe_routing_info,
       const std::vector<ModelSafeWorker*>& workers,
       ExtensionsActivityMonitor* extensions_activity_monitor,
       SyncManager::ChangeDelegate* change_delegate,
@@ -235,12 +234,6 @@ class SyncManagerImpl : public SyncManager,
   // Open the directory named with username_for_share
   bool OpenDirectory();
 
-  // Sign into sync with given credentials.
-  // We do not verify the tokens given. After this call, the tokens are set
-  // and the sync DB is open. True if successful, false if something
-  // went wrong.
-  bool SignIn(const SyncCredentials& credentials);
-
   void RequestNudgeForDataTypes(
       const tracked_objects::Location& nudge_location,
       ModelTypeSet type);