Add a Key class

chrome/browser/chromeos/login/fake_login_utils.h

Index: chrome/browser/chromeos/login/fake_login_utils.h
diff --git a/chrome/browser/chromeos/login/fake_login_utils.h b/chrome/browser/chromeos/login/fake_login_utils.h
index 478d3822c1590b8b60327166a641535af96b7149..fe512489fb1d447d7260e2e187f4b03b92ec4044 100644
--- a/chrome/browser/chromeos/login/fake_login_utils.h
+++ b/chrome/browser/chromeos/login/fake_login_utils.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_FAKE_LOGIN_UTILS_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_FAKE_LOGIN_UTILS_H_
 
+#include "chrome/browser/chromeos/login/auth/user_context.h"
 #include "chrome/browser/chromeos/login/login_utils.h"
 
 namespace chromeos {
@@ -35,16 +36,14 @@ class FakeLoginUtils : public LoginUtils {
   virtual void RestoreAuthenticationSession(Profile* profile) OVERRIDE;
   virtual void InitRlzDelayed(Profile* user_profile) OVERRIDE;
 
-  void SetExpectedCredentials(const std::string& username,
-                              const std::string& password);
+  void SetExpectedCredentials(const UserContext& user_context);
   void set_should_launch_browser(bool should_launch_browser) {
     should_launch_browser_ = should_launch_browser;
   }
 
  private:
   scoped_refptr<Authenticator> authenticator_;
-  std::string expected_username_;
-  std::string expected_password_;
+  UserContext expected_user_context_;
   bool should_launch_browser_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeLoginUtils);