cros: Cleanup lock screen and OOBE C++ backing code.

chrome/browser/chromeos/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("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 assert(is_chromeos)
@@ skipping 644 matching lines @@
     "login/help_app_launcher.cc",
     "login/help_app_launcher.h",
     "login/helper.cc",
     "login/helper.h",
     "login/hwid_checker.cc",
     "login/hwid_checker.h",
     "login/language_list.cc",
     "login/language_list.h",
     "login/lock/screen_locker.cc",
     "login/lock/screen_locker.h",
-    "login/lock/screen_locker_delegate.cc",
-    "login/lock/screen_locker_delegate.h",
     "login/lock/webui_screen_locker.cc",
     "login/lock/webui_screen_locker.h",
     "login/login_wizard.h",
     "login/profile_auth_data.cc",
     "login/profile_auth_data.h",
     "login/proxy_settings_dialog.h",
     "login/quick_unlock/pin_storage.cc",
     "login/quick_unlock/pin_storage.h",
     "login/quick_unlock/pin_storage_factory.cc",
     "login/quick_unlock/pin_storage_factory.h",
@@ skipping 934 matching lines @@
     "policy/proto/chrome_device_policy.proto",
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
   ]
 }