Refactor how the updater state data is serialized in update checks.

components/update_client/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("//net/features.gni")
 
 static_library("update_client") {
   sources = [
     "action.cc",
     "action.h",
@@ skipping 31 matching lines @@
     "update_client_errors.h",
     "update_client_internal.h",
     "update_engine.cc",
     "update_engine.h",
     "update_query_params.cc",
     "update_query_params.h",
     "update_query_params_delegate.cc",
     "update_query_params_delegate.h",
     "update_response.cc",
     "update_response.h",
+    "updater_state.cc",
+    "updater_state.h",
+    "updater_state_win.cc",
     "url_fetcher_downloader.cc",
     "url_fetcher_downloader.h",
     "utils.cc",
     "utils.h",
   ]
 
   deps = [
     "//base",
     "//components/client_update_protocol",
     "//components/crx_file",
@@ skipping 57 matching lines @@
   sources = [
     "component_patcher_unittest.cc",
     "component_unpacker_unittest.cc",
     "persisted_data_unittest.cc",
     "ping_manager_unittest.cc",
     "request_sender_unittest.cc",
     "update_checker_unittest.cc",
     "update_client_unittest.cc",
     "update_query_params_unittest.cc",
     "update_response_unittest.cc",
+    "updater_state_unittest.cc",
     "utils_unittest.cc",
   ]
 
   if (!disable_file_support) {
     sources += [ "crx_downloader_unittest.cc" ]
   }
 
   deps = [
     ":test_support",
     ":unit_tests_bundle_data",
     ":update_client",
     "//base",
     "//components/prefs",
     "//components/prefs:test_support",
     "//courgette:courgette_lib",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/libxml",
   ]
 }