Removed unused ScreenObserver::OnSetUsernamePassword() method.

chrome/browser/chromeos/login/wizard_controller.h

Index: chrome/browser/chromeos/login/wizard_controller.h
diff --git a/chrome/browser/chromeos/login/wizard_controller.h b/chrome/browser/chromeos/login/wizard_controller.h
index 56f87f9bf9ab7839838f208a0ddbf04567099f8c..11fb7f30b479acb85a81845cdee1cf8b5d52d62a 100644
--- a/chrome/browser/chromeos/login/wizard_controller.h
+++ b/chrome/browser/chromeos/login/wizard_controller.h
@@ -240,8 +240,6 @@ class WizardController : public ScreenObserver,
   // Overridden from ScreenObserver:
   virtual void OnExit(ExitCodes exit_code) override;
   virtual void ShowCurrentScreen() override;
-  virtual void OnSetUserNamePassword(const std::string& username,
-                                     const std::string& password) override;
   virtual void SetHostConfiguration() override;
   virtual void ConfigureHost(bool accepted_eula,
                              const std::string& lang,
@@ -270,9 +268,6 @@ class WizardController : public ScreenObserver,
   // Changes status area visibility.
   void SetStatusAreaVisible(bool visible);
 
-  // Logs in the specified user via default login screen.
-  void Login(const std::string& username, const std::string& password);
-
   // Launched kiosk app configured for auto-launch.
   void AutoLaunchKioskApp();
 
@@ -337,9 +332,6 @@ class WizardController : public ScreenObserver,
   // Screen that was active before, or NULL for login screen.
   BaseScreen* previous_screen_;
 
-  std::string username_;
-  std::string password_;
-
   // True if running official BUILD.
   bool is_official_build_;