Revert of Inline sign in extracts gaia id from HTTP header and seeds account tracker

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
index 22277e3daac435a485730d1419bb1633ac1f20b3..74dda856b23f502ad7d1dba44240b9ec003631c9 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -46,6 +46,7 @@
 
 namespace chromeos {
 
+class AuthenticatedUserEmailRetriever;
 class CaptivePortalWindowProxy;
 class CoreOobeActor;
 class ErrorScreensHistogramHelper;
@@ -394,6 +395,7 @@
   void HandleFocusPod(const std::string& user_id);
   void HandleHardlockPod(const std::string& user_id);
   void HandleLaunchKioskApp(const std::string& app_id, bool diagnostic_mode);
+  void HandleRetrieveAuthenticatedUserEmail(double attempt_token);
   void HandleGetPublicSessionKeyboardLayouts(const std::string& user_id,
                                              const std::string& locale);
   void HandleCancelConsumerManagementEnrollment();
@@ -518,6 +520,9 @@
   // TODO(ygorshenin@): remove this dependency.
   GaiaScreenHandler* gaia_screen_handler_;
 
+  // Helper that retrieves the authenticated user's e-mail address.
+  scoped_ptr<AuthenticatedUserEmailRetriever> email_retriever_;
+
   // Maximized mode controller delegate.
   scoped_ptr<TouchViewControllerDelegate> max_mode_delegate_;