Moving input device hotplug event processing outside of ui/display

ash/display/display_change_observer_chromeos.h

Index: ash/display/display_change_observer_chromeos.h
diff --git a/ash/display/display_change_observer_chromeos.h b/ash/display/display_change_observer_chromeos.h
index 346f35de45311ffc544fbcd2ad3946ef8b0b9c61..2edcf9c9e98b15f4325229788244bcf2aa110447 100644
--- a/ash/display/display_change_observer_chromeos.h
+++ b/ash/display/display_change_observer_chromeos.h
@@ -9,6 +9,7 @@
 #include "ash/shell_observer.h"
 #include "base/basictypes.h"
 #include "ui/display/chromeos/display_configurator.h"
+#include "ui/events/input_device_event_observer.h"
 
 namespace ash {
 
@@ -19,6 +20,7 @@ struct DisplayMode;
 // update DisplayManagers.
 class DisplayChangeObserver : public ui::DisplayConfigurator::StateController,
                               public ui::DisplayConfigurator::Observer,
+                              public ui::InputDeviceEventObserver,
                               public ShellObserver {
  public:
   // Returns the mode list for internal display.
@@ -43,6 +45,9 @@ class DisplayChangeObserver : public ui::DisplayConfigurator::StateController,
   virtual void OnDisplayModeChanged(
       const ui::DisplayConfigurator::DisplayStateList& outputs) OVERRIDE;
 
+  // Overriden from ui::InputDeviceEventObserver:
+  virtual void OnInputDeviceConfigurationChanged() OVERRIDE;
+
   // Overriden from ShellObserver:
   virtual void OnAppTerminating() OVERRIDE;