cros: Use ScreenManager as a component instead of deriving WizardController from it

chrome/browser/chromeos/login/oobe_localization_browsertest.cc

Index: chrome/browser/chromeos/login/oobe_localization_browsertest.cc
diff --git a/chrome/browser/chromeos/login/oobe_localization_browsertest.cc b/chrome/browser/chromeos/login/oobe_localization_browsertest.cc
index 8dd34734a4ab4b47c3752e8128319d6792daecd7..b389b27f4721098fbac3aa093772802b6d74662b 100644
--- a/chrome/browser/chromeos/login/oobe_localization_browsertest.cc
+++ b/chrome/browser/chromeos/login/oobe_localization_browsertest.cc
@@ -94,8 +94,8 @@ class TimedRunLoop {
 class LanguageListWaiter : public NetworkScreen::Observer {
  public:
   LanguageListWaiter()
-      : network_screen_(
-            NetworkScreen::Get(WizardController::default_controller())),
+      : network_screen_(NetworkScreen::Get(
+            WizardController::default_controller()->screen_manager())),
         loop_(base::TimeDelta::FromSeconds(kTimeoutSeconds), "LanguageList") {
     network_screen_->AddObserver(this);
     CheckLanguageList();