[cros] Display emails of users are stored in a separate dictionary in Local State.

chrome/browser/chromeos/login/login_display.h

Index: chrome/browser/chromeos/login/login_display.h
diff --git a/chrome/browser/chromeos/login/login_display.h b/chrome/browser/chromeos/login/login_display.h
index a3c77830276a741728c244406052e705a6fbe745..551e9c565162bbd36eff041a0c71f79dfb2b63bf 100644
--- a/chrome/browser/chromeos/login/login_display.h
+++ b/chrome/browser/chromeos/login/login_display.h
@@ -12,21 +12,12 @@
 #include "base/string16.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
 #include "chrome/browser/chromeos/login/user.h"
+#include "chrome/browser/chromeos/login/user_manager.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/rect.h"
 
 namespace chromeos {
 
-// Delegate to be used while user removing.
-class RemoveUserDelegate {
- public:
-  // Called right before actual user removal process is initiated.
-  virtual void OnBeforeUserRemoved(const std::string& username) = 0;
-
-  // Called right after user removal process has been initiated.
-  virtual void OnUserRemoved(const std::string& username) = 0;
-};
-
 // TODO(nkostylev): Extract interface, create a BaseLoginDisplay class.
 // An abstract class that defines login UI implementation.
 class LoginDisplay : public RemoveUserDelegate {
@@ -42,6 +33,10 @@ class LoginDisplay : public RemoveUserDelegate {
     // Users decides to sign in into captive portal.
     virtual void FixCaptivePortal() = 0;
 
+    // Sets the displayed email for the next login attempt. If it succeeds,
+    // user's displayed email value will be updated to |email|.
+    virtual void SetDisplayEmail(const std::string& email) = 0;
+
     // Complete sign process with specified |username| and |password|.
     // Used for new users authenticated through an extension.
     virtual void CompleteLogin(const std::string& username,