Apply gn format with 'sources' sorting to src/

sync/protocol/BUILD.gn

 # 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.
 
 import("//third_party/protobuf/proto_library.gni")
 
 proto_library("protocol") {
   sources = [
+    "app_list_specifics.proto",
     "app_notification_specifics.proto",
     "app_setting_specifics.proto",
     "app_specifics.proto",
-    "app_list_specifics.proto",
     "article_specifics.proto",
     "attachments.proto",
     "autofill_specifics.proto",
     "bookmark_specifics.proto",
     "client_commands.proto",
     "client_debug_info.proto",
     "device_info_specifics.proto",
     "dictionary_specifics.proto",
     "encryption.proto",
     "experiment_status.proto",
     "experiments_specifics.proto",
     "extension_setting_specifics.proto",
     "extension_specifics.proto",
     "favicon_image_specifics.proto",
     "favicon_tracking_specifics.proto",
     "get_updates_caller_info.proto",
     "history_delete_directive_specifics.proto",
-    "nigori_specifics.proto",
     "managed_user_setting_specifics.proto",
     "managed_user_shared_setting_specifics.proto",
     "managed_user_specifics.proto",
     "managed_user_whitelist_specifics.proto",
+    "nigori_specifics.proto",
     "password_specifics.proto",
     "preference_specifics.proto",
     "priority_preference_specifics.proto",
     "search_engine_specifics.proto",
     "session_specifics.proto",
     "sync.proto",
     "sync_enums.proto",
     "synced_notification_app_info_specifics.proto",
     "synced_notification_specifics.proto",
     "test.proto",
     "theme_specifics.proto",
     "typed_url_specifics.proto",
     "unique_position.proto",
     "wifi_credential_specifics.proto",
   ]
 
   cc_generator_options = "dllexport_decl=SYNC_PROTO_EXPORT:"
   cc_include = "sync/protocol/sync_proto_export.h"
 
   defines = [ "SYNC_PROTO_IMPLEMENTATION" ]
 
   extra_configs = [ "//build/config/compiler:wexit_time_destructors" ]
 }