oobe/login: Delegate accelerator handling to LoginDisplayHost

Bug: 1102393
Change-Id: I07e1be1c95efec803110296e3bcd1de0f6576bed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283333
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Auto-Submit: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786687}

diff --git a/ash/login/login_screen_controller.cc b/ash/login/login_screen_controller.cc
index a3d1851..f469957 100644
--- a/ash/login/login_screen_controller.cc
+++ b/ash/login/login_screen_controller.cc

@@ -270,12 +270,6 @@
   client_->RequestPublicSessionKeyboardLayouts(account_id, locale);
 }
 
-void LoginScreenController::ShowFeedback() {
-  if (!client_)
-    return;
-  client_->ShowFeedback();
-}
-
 void LoginScreenController::SetClient(LoginScreenClient* client) {
   client_ = client;
 }
@@ -421,8 +415,11 @@
       ->SetKioskApps(kiosk_apps, launch_app, on_show_menu);
 }
 
-void LoginScreenController::ShowResetScreen() {
-  client_->ShowResetScreen();
+void LoginScreenController::HandleAccelerator(
+    ash::LoginAcceleratorAction action) {
+  if (!client_)
+    return;
+  client_->HandleAccelerator(action);
 }
 
 void LoginScreenController::ShowAccountAccessHelpApp(