[fsp] Separate logic for saving/restoring state to a separate class.

chrome/chrome_browser_chromeos.gypi

 # 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': {
     # These files lists are shared with the GN build.
     'browser_chromeos_sources': [
         # All .cc, .h, .m, and .mm files under browser/chromeos, except for tests
@@ skipping 309 matching lines @@
         'browser/chromeos/file_system_provider/operations/write_file.cc',
         'browser/chromeos/file_system_provider/operations/write_file.h',
         'browser/chromeos/file_system_provider/provided_file_system.cc',
         'browser/chromeos/file_system_provider/provided_file_system.h',
         'browser/chromeos/file_system_provider/provided_file_system_info.cc',
         'browser/chromeos/file_system_provider/provided_file_system_info.h',
         'browser/chromeos/file_system_provider/provided_file_system_interface.cc',
         'browser/chromeos/file_system_provider/provided_file_system_interface.h',
         'browser/chromeos/file_system_provider/provided_file_system_observer.cc',
         'browser/chromeos/file_system_provider/provided_file_system_observer.h',
+        'browser/chromeos/file_system_provider/registry.cc',
+        'browser/chromeos/file_system_provider/registry.h',
+        'browser/chromeos/file_system_provider/registry_interface.cc',
+        'browser/chromeos/file_system_provider/registry_interface.h',
         'browser/chromeos/file_system_provider/request_manager.cc',
         'browser/chromeos/file_system_provider/request_manager.h',
         'browser/chromeos/file_system_provider/request_value.cc',
         'browser/chromeos/file_system_provider/request_value.h',
         'browser/chromeos/file_system_provider/service.cc',
         'browser/chromeos/file_system_provider/service.h',
         'browser/chromeos/file_system_provider/service_factory.cc',
         'browser/chromeos/file_system_provider/service_factory.h',
         'browser/chromeos/fileapi/external_file_protocol_handler.cc',
         'browser/chromeos/fileapi/external_file_protocol_handler.h',
@@ skipping 903 matching lines @@
         'browser/chromeos/attestation/attestation_signed_data.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/attestation',
         'proto_out_dir': 'chrome/browser/chromeos/attestation',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }