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

ui/base/events/event_handler.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // 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 {
 
 class GestureEvent;
 class KeyEvent;
 class MouseEvent;
 class ScrollEvent;
 class TouchEvent;
 
@@ skipping 18 matching lines @@
                                    TouchEvent* event) = 0;
 
   virtual EventResult OnGestureEvent(EventTarget* target,
                                      GestureEvent* event) = 0;
 };
 
 typedef std::vector<EventHandler*> EventHandlerList;
 
 }  // namespace ui
 
-#endif  // UI_BASE_EVENTS_EVENT_HANDLER_H_
+#endif  // UI_BASE_EVENTS_EVENT_CONSTANTS_EVENTS_EVENT_HANDLER_H_