[Sync] Remove backend unrecoverable error handler

chrome/browser/sync/glue/sync_backend_host_impl.h

Index: chrome/browser/sync/glue/sync_backend_host_impl.h
diff --git a/chrome/browser/sync/glue/sync_backend_host_impl.h b/chrome/browser/sync/glue/sync_backend_host_impl.h
index b8e3b07b028a5f0e0f3af3154b43e365069a1ca0..3f1501838457c4a3c0a0552715bd70d613796ed3 100644
--- a/chrome/browser/sync/glue/sync_backend_host_impl.h
+++ b/chrome/browser/sync/glue/sync_backend_host_impl.h
@@ -24,7 +24,6 @@
 #include "sync/internal_api/public/sessions/sync_session_snapshot.h"
 #include "sync/internal_api/public/sessions/type_debug_info_observer.h"
 #include "sync/internal_api/public/sync_manager.h"
-#include "sync/internal_api/public/util/unrecoverable_error_handler.h"
 #include "sync/internal_api/public/util/weak_handle.h"
 #include "sync/protocol/encryption.pb.h"
 #include "sync/protocol/sync_protocol_error.h"
@@ -44,6 +43,7 @@ class InvalidationService;
 namespace syncer {
 class NetworkResources;
 class SyncManagerFactory;
+class UnrecoverableErrorHandler;
 }
 
 namespace sync_driver {
@@ -86,7 +86,8 @@ class SyncBackendHostImpl
       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)