Revert 170641 because it broke mac-debug build.

ui/base/events/event_handler.cc

Index: ui/base/events/event_handler.cc
===================================================================
--- ui/base/events/event_handler.cc	(revision 170644)
+++ ui/base/events/event_handler.cc	(working copy)
@@ -4,8 +4,6 @@
 
 #include "ui/base/events/event_handler.h"
 
-#include "ui/base/events/event.h"
-
 namespace ui {
 
 EventHandler::EventHandler() {
@@ -15,16 +13,6 @@
 }
 
 EventResult EventHandler::OnEvent(Event* event) {
-  if (event->IsKeyEvent())
-    return OnKeyEvent(static_cast<KeyEvent*>(event));
-  if (event->IsMouseEvent())
-    return OnMouseEvent(static_cast<MouseEvent*>(event));
-  if (event->IsScrollEvent())
-    return OnScrollEvent(static_cast<ScrollEvent*>(event));
-  if (event->IsTouchEvent())
-    return OnTouchEvent(static_cast<TouchEvent*>(event));
-  if (event->IsGestureEvent())
-    return OnGestureEvent(static_cast<GestureEvent*>(event));
   return ui::ER_UNHANDLED;
 }