events: Dispatch all events through EventHandler::OnEvent from the dispatcher.

ui/base/events/event_dispatcher.h

Index: ui/base/events/event_dispatcher.h
diff --git a/ui/base/events/event_dispatcher.h b/ui/base/events/event_dispatcher.h
index 42d208c474b1706f1e95ffff09385fa1aa841134..4177848107be088bd419cec4c21b438984d338ec 100644
--- a/ui/base/events/event_dispatcher.h
+++ b/ui/base/events/event_dispatcher.h
@@ -115,16 +115,6 @@ class UI_EXPORT EventDispatcher {
   }
 
   EventResult DispatchEventToSingleHandler(EventHandler* handler, Event* event);
-  EventResult DispatchEventToSingleHandler(EventHandler* handler,
-                                           KeyEvent* event);
-  EventResult DispatchEventToSingleHandler(EventHandler* handler,
-                                           MouseEvent* event);
-  EventResult DispatchEventToSingleHandler(EventHandler* handler,
-                                           ScrollEvent* event);
-  EventResult DispatchEventToSingleHandler(EventHandler* handler,
-                                           TouchEvent* event);
-  EventResult DispatchEventToSingleHandler(EventHandler* handler,
-                                           GestureEvent* event);
 
   // This is used to track whether the dispatcher has been destroyed in the
   // middle of dispatching an event.