events: Move some files into ui/base/events/

ui/base/events/event_handler.h

Index: ui/base/events/event_handler.h
diff --git a/ui/base/events/event_handler.h b/ui/base/events/event_handler.h
index 74115364accce28a77bae363b3eb7883191d7c55..e331bdc83e424159c0d22de144ddc08476820fa6 100644
--- a/ui/base/events/event_handler.h
+++ b/ui/base/events/event_handler.h
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UI_BASE_EVENTS_EVENT_HANDLER_H_
-#define UI_BASE_EVENTS_EVENT_HANDLER_H_
+#ifndef UI_BASE_EVENTS_EVENT_CONSTANTS_EVENTS_EVENT_HANDLER_H_
+#define UI_BASE_EVENTS_EVENT_CONSTANTS_EVENTS_EVENT_HANDLER_H_
 
 #include <vector>
 
-#include "ui/base/events.h"
+#include "ui/base/events/event_constants.h"
 #include "ui/base/ui_export.h"
 
 namespace ui {
@@ -46,4 +46,4 @@ typedef std::vector<EventHandler*> EventHandlerList;
 
 }  // namespace ui
 
-#endif  // UI_BASE_EVENTS_EVENT_HANDLER_H_
+#endif  // UI_BASE_EVENTS_EVENT_CONSTANTS_EVENTS_EVENT_HANDLER_H_