Fix the flaky test KioskTest.LaunchAppUserCancel

chrome/browser/chromeos/login/app_launch_signin_screen.cc

Index: chrome/browser/chromeos/login/app_launch_signin_screen.cc
diff --git a/chrome/browser/chromeos/login/app_launch_signin_screen.cc b/chrome/browser/chromeos/login/app_launch_signin_screen.cc
index 797c76514eee9658b0a7dd42681b7e6d4de6661a..1356b0d86f55558b689319e5ee29ad7fdb212d4a 100644
--- a/chrome/browser/chromeos/login/app_launch_signin_screen.cc
+++ b/chrome/browser/chromeos/login/app_launch_signin_screen.cc
@@ -159,6 +159,18 @@ bool AppLaunchSigninScreen::IsShowUsers() const {
   return true;
 }
 
+bool AppLaunchSigninScreen::ShowUsersHasChanged() const {
+  return false;
+}
+
+bool AppLaunchSigninScreen::IsAllowNewUser() const {
+  return true;
+}
+
+bool AppLaunchSigninScreen::AllowNewUserChanged() const {
+  return false;
+}
+
 bool AppLaunchSigninScreen::IsSigninInProgress() const {
   // Return true to suppress network processing in the signin screen.
   return true;