chromeos: A little more cleanup for EventRewriter.

chrome/browser/chromeos/device_hierarchy_observer.h

Index: chrome/browser/chromeos/device_hierarchy_observer.h
diff --git a/chrome/browser/chromeos/device_hierarchy_observer.h b/chrome/browser/chromeos/device_hierarchy_observer.h
index 7e13ac6c17d0fbf5d0e4e01982d87673d875baf1..86c53724b4a8ff76945171552c857ec80c96c274 100644
--- a/chrome/browser/chromeos/device_hierarchy_observer.h
+++ b/chrome/browser/chromeos/device_hierarchy_observer.h
@@ -17,11 +17,6 @@ class DeviceHierarchyObserver {
   virtual void DeviceAdded(int device_id) = 0;
   virtual void DeviceRemoved(int device_id) = 0;
 
-  // Called when a key on either a built-in keyboard or an external one is
-  // pressed.  |device_id| is the source of the key event which will be sent to
-  // the Chrome window shortly.
-  virtual void DeviceKeyPressedOrReleased(int device_id) = 0;
-
  protected:
   virtual ~DeviceHierarchyObserver() {}
 };