Revert of Multiprofile security: Show a warning messagebox when desktop casting/sharing is turned on upon user

chrome/browser/ui/ash/session_state_delegate_chromeos.h

Index: chrome/browser/ui/ash/session_state_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/session_state_delegate_chromeos.h b/chrome/browser/ui/ash/session_state_delegate_chromeos.h
index a177c35aa52fe36c0744e352222c7bee52342880..3f9d2affd52fae43d72be7c88d40347d3e8fd2f1 100644
--- a/chrome/browser/ui/ash/session_state_delegate_chromeos.h
+++ b/chrome/browser/ui/ash/session_state_delegate_chromeos.h
@@ -76,10 +76,6 @@
   // Notify observers about session state change.
   void NotifySessionStateChanged();
 
-  // Switches to a new user. This call might show a dialog asking the user if he
-  // wants to stop desktop casting before switching.
-  void TryToSwitchUser(const std::string& user_id);
-
   // List of observers is only used on Chrome OS for now.
   ObserverList<ash::SessionStateObserver> session_state_observer_list_;