cros: Replace WizardController string constants with OobeScreen values.

chrome/browser/chromeos/login/session/user_session_manager.cc

Index: chrome/browser/chromeos/login/session/user_session_manager.cc
diff --git a/chrome/browser/chromeos/login/session/user_session_manager.cc b/chrome/browser/chromeos/login/session/user_session_manager.cc
index 2b9a0bcc65a0e47a2741eb3ba2a4a37a7a2ecf00..0b78499b2fd0f35d18b760f3a470341c22c3c462 100644
--- a/chrome/browser/chromeos/login/session/user_session_manager.cc
+++ b/chrome/browser/chromeos/login/session/user_session_manager.cc
@@ -1191,10 +1191,10 @@ void UserSessionManager::FinalizePrepareProfile(Profile* profile) {
     delegate_->OnProfilePrepared(profile, browser_launched);
 }
 
-void UserSessionManager::ActivateWizard(const std::string& screen_name) {
+void UserSessionManager::ActivateWizard(OobeScreen screen) {
   LoginDisplayHost* host = LoginDisplayHost::default_host();
   CHECK(host);
-  host->StartWizard(screen_name);
+  host->StartWizard(screen);
 }
 
 void UserSessionManager::InitializeStartUrls() const {
@@ -1273,7 +1273,7 @@ bool UserSessionManager::InitializeUserSession(Profile* profile) {
       if (!StartupUtils::IsDeviceRegistered())
         StartupUtils::MarkDeviceRegistered(base::Closure());
 
-      ActivateWizard(WizardController::kTermsOfServiceScreenName);
+      ActivateWizard(OobeScreen::SCREEN_TERMS_OF_SERVICE);
       return false;
     }
   }