Add kiosk browser tests for network configuration.

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 d567a1034cf5cf16d61625bb44e0e0b7fc72a91d..0d4d6b6bcb4e9b0bbf81c9b4f2ba48e58d060a78 100644
--- a/chrome/browser/chromeos/login/app_launch_signin_screen.cc
+++ b/chrome/browser/chromeos/login/app_launch_signin_screen.cc
@@ -17,7 +17,8 @@ AppLaunchSigninScreen::AppLaunchSigninScreen(
     OobeUI* oobe_ui, Delegate* delegate)
     : oobe_ui_(oobe_ui),
       delegate_(delegate),
-      webui_handler_(NULL) {
+      webui_handler_(NULL),
+      user_manager_for_testing_(NULL) {
 }
 
 AppLaunchSigninScreen::~AppLaunchSigninScreen() {
@@ -30,7 +31,7 @@ void AppLaunchSigninScreen::Show() {
 }
 
 void AppLaunchSigninScreen::InitOwnerUserList() {
-  UserManager* user_manager = UserManager::Get();
+  UserManager* user_manager = GetUserManager();
   const std::string& owner_email = user_manager->GetOwnerEmail();
   const UserList& all_users = user_manager->GetUsers();
 
@@ -46,6 +47,11 @@ void AppLaunchSigninScreen::InitOwnerUserList() {
   }
 }
 
+UserManager* AppLaunchSigninScreen::GetUserManager() {
+  return user_manager_for_testing_ ?
+      user_manager_for_testing_ : UserManager::Get();
+}
+
 void AppLaunchSigninScreen::CancelPasswordChangedFlow() {
   NOTREACHED();
 }