cros: Make sure views-based lock screen is destroyed after it is dismissed.

ash/login/lock_screen_controller.cc

Index: ash/login/lock_screen_controller.cc
diff --git a/ash/login/lock_screen_controller.cc b/ash/login/lock_screen_controller.cc
index 5ff835e034049bb50717f77809a1f13da4591d08..2cc4fdd8c7f1cf7d0d1926f52d3146262754f032 100644
--- a/ash/login/lock_screen_controller.cc
+++ b/ash/login/lock_screen_controller.cc
@@ -4,6 +4,7 @@
 
 #include "ash/login/lock_screen_controller.h"
 
+#include "ash/login/ui/lock_screen.h"
 #include "chromeos/cryptohome/system_salt_getter.h"
 #include "chromeos/login/auth/user_context.h"
 
@@ -41,6 +42,11 @@ void LockScreenController::ShowErrorMessage(int32_t login_attempts,
 
 void LockScreenController::ClearErrors() {
   NOTIMPLEMENTED();
+
+  // TODO: At the moment, we don't have a notification that authentication has
+  // succeeded. ClearErrors is delivered though after login success so we reuse
+  // that. This should be done in a mojo call like AnimateAuthenticationSuccess.
+  DestroyLockScreen();
 }
 
 void LockScreenController::DoAuthenticateUser(const AccountId& account_id,