monitor_reconfig: Disable external output to avoid error.

monitor_reconfigure_main.h

Index: monitor_reconfigure_main.h
diff --git a/monitor_reconfigure_main.h b/monitor_reconfigure_main.h
index aeac10f90afad7094fd3ef082284b845d9f38db5..d639fb157acd7258e41af543165162a5a51ab322 100644
--- a/monitor_reconfigure_main.h
+++ b/monitor_reconfigure_main.h
@@ -39,11 +39,14 @@ class MonitorReconfigureMain {
   void SortModesByResolution(const XRROutputInfo& output_info,
                              std::vector<ResolutionSelector::Mode>* modes_out);
 
-  // Set the resolution for a particular display or for the screen.
+  // Set the resolution for a particular device or for the screen.
   bool SetDeviceResolution(const std::string& device_name,
                            const std::string& resolution);
   bool SetScreenResolution(const std::string& resolution);
 
+  // Disable output to a device.
+  bool DisableDevice(const std::string& device_name);
+
   // Mapping between mode XIDs and mode information structures.
   std::map<int, XRRModeInfo*> mode_map_;