[Sync] Move SyncPrefs into sync_driver component

components/sync_driver.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'sync_driver',
       'type': 'static_library',
       'dependencies': [
@@ skipping 13 matching lines @@
         'sync_driver/data_type_encryption_handler.h',
         'sync_driver/data_type_error_handler.h',
         'sync_driver/data_type_manager.cc',
         'sync_driver/data_type_manager.h',
         'sync_driver/data_type_manager_observer.h',
         'sync_driver/failed_data_types_handler.cc',
         'sync_driver/failed_data_types_handler.h',
         'sync_driver/model_association_manager.cc',
         'sync_driver/model_association_manager.h',
         'sync_driver/model_associator.h',
+        'sync_driver/pref_names.cc',
+        'sync_driver/pref_names.h',
         'sync_driver/proxy_data_type_controller.cc',
         'sync_driver/proxy_data_type_controller.h',
         'sync_driver/sync_frontend.cc',
         'sync_driver/sync_frontend.h',
+        'sync_driver/sync_prefs.cc',
+        'sync_driver/sync_prefs.h',
         'sync_driver/system_encryptor.cc',
         'sync_driver/system_encryptor.h',
         'sync_driver/user_selectable_sync_type.h',
       ],
     },
     {
       'target_name': 'sync_driver_test_support',
       'type': 'static_library',
       'dependencies': [
         'sync_driver',
@@ skipping 13 matching lines @@
         'sync_driver/data_type_manager_mock.cc',
         'sync_driver/data_type_manager_mock.h',
         'sync_driver/fake_data_type_controller.cc',
         'sync_driver/fake_data_type_controller.h',
         'sync_driver/model_associator_mock.cc',
         'sync_driver/model_associator_mock.h',
       ],
     },
   ],
 }