Refactor kiosk app launch to be part of login screen UI flow.

chrome/browser/chromeos/login/existing_user_controller.h

Index: chrome/browser/chromeos/login/existing_user_controller.h
diff --git a/chrome/browser/chromeos/login/existing_user_controller.h b/chrome/browser/chromeos/login/existing_user_controller.h
index 7a2ff11666e38d5d24e74cddcff54bab1092964d..0580c0b842370e90123ec43781eb531d87c6058f 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.h
+++ b/chrome/browser/chromeos/login/existing_user_controller.h
@@ -67,9 +67,6 @@ class ExistingUserController : public LoginDisplay::Delegate,
   // Tells the controller to resume a pending login.
   void ResumeLogin();
 
-  // Invoked to prepare for a kiosk app launch attempt.
-  void PrepareKioskAppLaunch();
-
   // Start the public session auto-login timer.
   void StartPublicSessionAutoLoginTimer();
 
@@ -87,6 +84,7 @@ class ExistingUserController : public LoginDisplay::Delegate,
   virtual void LoginAsRetailModeUser() OVERRIDE;
   virtual void LoginAsGuest() OVERRIDE;
   virtual void LoginAsPublicAccount(const std::string& username) OVERRIDE;
+  virtual void LoginAsKioskApp(const std::string& app_id) OVERRIDE;
   virtual void OnSigninScreenReady() OVERRIDE;
   virtual void OnUserSelected(const std::string& username) OVERRIDE;
   virtual void OnStartEnterpriseEnrollment() OVERRIDE;