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

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index 02c6a27a2d5d75ac1cc1d24515a34ecd9f4ad1d5..bb246fd040f539fef41f833c53fda241f8a2a179 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -92,6 +92,9 @@ class SessionStateDelegateImpl : public SessionStateDelegate {
     // ash_shell has 2 users.
     return 2;
   }
+  virtual int GetNumberOfUsersAdmittedForMultiProfile() const OVERRIDE {
+    return GetMaximumNumberOfLoggedInUsers() - NumberOfLoggedInUsers();
+  }
   virtual bool IsActiveUserSessionStarted() const OVERRIDE { return true; }
   virtual bool CanLockScreen() const OVERRIDE { return true; }
   virtual bool IsScreenLocked() const OVERRIDE { return screen_locked_; }