[Sync] Remove backend unrecoverable error handler

chrome/browser/sync/glue/sync_backend_host_impl.cc

Index: chrome/browser/sync/glue/sync_backend_host_impl.cc
diff --git a/chrome/browser/sync/glue/sync_backend_host_impl.cc b/chrome/browser/sync/glue/sync_backend_host_impl.cc
index b5db3d09c35294195b0826f73bcc8c73fe100c92..598c0e16ea65c83af824c074ec1cc7425ac1592c 100644
--- a/chrome/browser/sync/glue/sync_backend_host_impl.cc
+++ b/chrome/browser/sync/glue/sync_backend_host_impl.cc
@@ -105,7 +105,8 @@ void SyncBackendHostImpl::Initialize(
     const syncer::SyncCredentials& credentials,
     bool delete_sync_data_folder,
     scoped_ptr<syncer::SyncManagerFactory> sync_manager_factory,
-    scoped_ptr<syncer::UnrecoverableErrorHandler> unrecoverable_error_handler,
+    const syncer::WeakHandle<syncer::UnrecoverableErrorHandler>&
+        unrecoverable_error_handler,
     const base::Closure& report_unrecoverable_error_function,
     syncer::NetworkResources* network_resources,
     scoped_ptr<syncer::SyncEncryptionHandler::NigoriState> saved_nigori_state) {
@@ -159,7 +160,7 @@ void SyncBackendHostImpl::Initialize(
       scoped_ptr<InternalComponentsFactory>(
           new syncer::InternalComponentsFactoryImpl(factory_switches))
           .Pass(),
-      unrecoverable_error_handler.Pass(), report_unrecoverable_error_function,
+      unrecoverable_error_handler, report_unrecoverable_error_function,
       saved_nigori_state.Pass(), clear_data_option, invalidation_versions));
   InitCore(init_opts.Pass());
 }