Revert of Remove InputMethodEventHandler.

ui/aura/window_event_dispatcher.h

Index: ui/aura/window_event_dispatcher.h
diff --git a/ui/aura/window_event_dispatcher.h b/ui/aura/window_event_dispatcher.h
index fad430eed2f14b3713ab996b138b189cc75da4a8..4ec5804b9d7da69b42f2eae6c641968e41166128 100644
--- a/ui/aura/window_event_dispatcher.h
+++ b/ui/aura/window_event_dispatcher.h
@@ -120,10 +120,6 @@
   //             observer.
   void OnPostNotifiedWindowDestroying(Window* window);
 
-  // True to skip sending event to the InputMethod.
-  void set_skip_ime(bool skip_ime) { skip_ime_ = skip_ime; }
-  bool should_skip_ime() const { return skip_ime_; }
-
  private:
   FRIEND_TEST_ALL_PREFIXES(WindowEventDispatcherTest,
                            KeepTranslatedEventInRoot);
@@ -242,7 +238,6 @@
                                                  ui::MouseEvent* event);
   ui::EventDispatchDetails PreDispatchTouchEvent(Window* target,
                                                  ui::TouchEvent* event);
-  ui::EventDispatchDetails PreDispatchKeyEvent(ui::KeyEvent* event);
 
   WindowTreeHost* host_;
 
@@ -275,8 +270,6 @@
   // The default EventTargeter for WindowEventDispatcher generated events.
   std::unique_ptr<WindowTargeter> event_targeter_;
 
-  bool skip_ime_;
-
   // Used to schedule reposting an event.
   base::WeakPtrFactory<WindowEventDispatcher> repost_event_factory_;