Fix SyncManager initialization failure crash.

sync/sync.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     # The core sync library.
@@ skipping 149 matching lines @@
         'syncable/directory.h',
         'syncable/directory_backing_store.cc',
         'syncable/directory_backing_store.h',
         'syncable/directory_change_delegate.h',
         'syncable/entry.cc',
         'syncable/entry.h',
         'syncable/entry_kernel.cc',
         'syncable/entry_kernel.h',
         'syncable/in_memory_directory_backing_store.cc',
         'syncable/in_memory_directory_backing_store.h',
+        'syncable/invalid_directory_backing_store.cc',
+        'syncable/invalid_directory_backing_store.h',
         'syncable/metahandle_set.h',
         'syncable/model_type.cc',
         'syncable/mutable_entry.cc',
         'syncable/mutable_entry.h',
         'syncable/nigori_util.cc',
         'syncable/nigori_util.h',
         'syncable/on_disk_directory_backing_store.cc',
         'syncable/on_disk_directory_backing_store.h',
         'syncable/read_transaction.cc',
         'syncable/read_transaction.h',
@@ skipping 657 matching lines @@
             'test_suite_name': 'sync_unit_tests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)sync_unit_tests<(SHARED_LIB_SUFFIX)',
             'input_jars_paths': [ '<(PRODUCT_DIR)/lib.java/chromium_base.jar', ],
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }