NetworkHandler: Add ui_proxy_config_service

chrome/browser/chromeos/BUILD.gn

Index: chrome/browser/chromeos/BUILD.gn
diff --git a/chrome/browser/chromeos/BUILD.gn b/chrome/browser/chromeos/BUILD.gn
index 3ad71742501f013c492bad04120c28ac5738ab84..0ea7d996a0ba92a3abdfe2918c39038614dc9c2f 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -919,6 +919,8 @@ source_set("chromeos") {
     "net/network_portal_notification_controller.h",
     "net/network_portal_web_dialog.cc",
     "net/network_portal_web_dialog.h",
+    "net/network_pref_state_observer.cc",
+    "net/network_pref_state_observer.h",
     "net/network_state_notifier.cc",
     "net/network_state_notifier.h",
     "net/shill_error.cc",
@@ -1478,6 +1480,7 @@ source_set("unit_tests") {
     "net/client_cert_store_chromeos_unittest.cc",
     "net/network_portal_detector_impl_unittest.cc",
     "net/network_portal_notification_controller_unittest.cc",
+    "net/network_pref_state_observer_unittest.cc",
     "net/network_state_notifier_unittest.cc",
     "net/wake_on_wifi_manager_unittest.cc",
     "options/network_property_ui_data_unittest.cc",