Convert KeyboardDrivenEventRewriter to a ui::EventRewriter.

chrome/browser/chromeos/events/event_rewriter.h

Index: chrome/browser/chromeos/events/event_rewriter.h
diff --git a/chrome/browser/chromeos/events/event_rewriter.h b/chrome/browser/chromeos/events/event_rewriter.h
index 7caaad5da82bcf46e4964d8f110b4c34e2759397..c25d7b9ae884b1647e2efdeb44658f59367e7394 100644
--- a/chrome/browser/chromeos/events/event_rewriter.h
+++ b/chrome/browser/chromeos/events/event_rewriter.h
@@ -22,7 +22,6 @@ class PrefService;
 typedef union _XEvent XEvent;
 
 namespace chromeos {
-class KeyboardDrivenEventRewriter;
 namespace input_method {
 class ImeKeyboard;
 }
@@ -193,9 +192,6 @@ class EventRewriter : public DeviceHierarchyObserver,
 
   input_method::ImeKeyboard* keyboard_for_testing_;
 
-  scoped_ptr<KeyboardDrivenEventRewriter>
-      keyboard_driven_event_rewriter_;
-
   const PrefService* pref_service_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(EventRewriter);