Update data reduction proxy statistics prefs less often on desktop

components/data_reduction_proxy.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': [
     {
       # GN version: //components/data_reduction_proxy/browser
       'target_name': 'data_reduction_proxy_browser',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
         '../crypto/crypto.gyp:crypto',
         '../net/net.gyp:net',
         'data_reduction_proxy_common',
         'pref_registry',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
         'data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc',
         'data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.h',
+        'data_reduction_proxy/browser/data_reduction_proxy_delayed_pref_service.cc',
+        'data_reduction_proxy/browser/data_reduction_proxy_delayed_pref_service.h',
         'data_reduction_proxy/browser/data_reduction_proxy_config_service.cc',
         'data_reduction_proxy/browser/data_reduction_proxy_config_service.h',
         'data_reduction_proxy/browser/data_reduction_proxy_configurator.h',
         'data_reduction_proxy/browser/data_reduction_proxy_metrics.cc',
         'data_reduction_proxy/browser/data_reduction_proxy_metrics.h',
         'data_reduction_proxy/browser/data_reduction_proxy_params.cc',
         'data_reduction_proxy/browser/data_reduction_proxy_params.h',
         'data_reduction_proxy/browser/data_reduction_proxy_prefs.cc',
         'data_reduction_proxy/browser/data_reduction_proxy_prefs.h',
         'data_reduction_proxy/browser/data_reduction_proxy_protocol.cc',
@@ skipping 44 matching lines @@
         # Note: sources list duplicated in GN build.
         'data_reduction_proxy/browser/data_reduction_proxy_params_test_utils.cc',
         'data_reduction_proxy/browser/data_reduction_proxy_params_test_utils.h',
         'data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc',
         'data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.h',
       ],
     },
   ],
 }