[Sync] Remove backend unrecoverable error handler

sync/syncable/directory_unittest.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SYNC_SYNCABLE_DIRECTORY_UNITTEST_H_
 #define SYNC_SYNCABLE_DIRECTORY_UNITTEST_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 70 matching lines @@
 
   void GetAllMetaHandles(BaseTransaction* trans, MetahandleSet* result);
   void CheckPurgeEntriesWithTypeInSucceeded(ModelTypeSet types_to_purge,
                                             bool before_reload);
   bool IsInDirtyMetahandles(int64 metahandle);
   bool IsInMetahandlesToPurge(int64 metahandle);
 
   scoped_ptr<Directory>& dir();
   DirectoryChangeDelegate* directory_change_delegate();
   Encryptor* encryptor();
-  UnrecoverableErrorHandler* unrecoverable_error_handler();
+  TestUnrecoverableErrorHandler* unrecoverable_error_handler();
 
  private:
   void ValidateEntry(BaseTransaction* trans,
                      int64 id,
                      bool check_name,
                      const std::string& name,
                      int64 base_version,
                      int64 server_version,
                      bool is_del);
 
   base::MessageLoop message_loop_;
   scoped_ptr<Directory> dir_;
   NullDirectoryChangeDelegate delegate_;
   FakeEncryptor encryptor_;
   TestUnrecoverableErrorHandler handler_;
   sql::Connection connection_;
 };
 
 }  // namespace syncable
 
 }  // namespace syncer
 
 #endif  // SYNC_SYNCABLE_DIRECTORY_UNITTEST_H_