Fixed suggesting adding more users into multi-profile session when we don't have more

ash/session/session_state_delegate.h

Index: ash/session/session_state_delegate.h
diff --git a/ash/session/session_state_delegate.h b/ash/session/session_state_delegate.h
index c1c07137105fede9e833dff7e3aef703dcb2ea0d..96af57beb257f9a31e6273d9e95ddca72ed06098 100644
--- a/ash/session/session_state_delegate.h
+++ b/ash/session/session_state_delegate.h
@@ -82,6 +82,9 @@ class ASH_EXPORT SessionStateDelegate {
   // no session in progress or no active user.
   virtual int NumberOfLoggedInUsers() const = 0;
 
+  // Returns number of users admitted for logging in into multi-profile session.
+  virtual int GetNumberOfUsersAdmittedForMultiProfile() const = 0;
+
   // Returns |true| if the session has been fully started for the active user.
   // When a user becomes active, the profile and browser UI are not immediately
   // available. Only once this method starts returning |true| is the browser