Move xfa/fwl/core to xfa/fwl.

xfa/fwl/core/cfwl_message.h

-// Copyright 2016 PDFium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
-
-#ifndef XFA_FWL_CORE_CFWL_MESSAGE_H_
-#define XFA_FWL_CORE_CFWL_MESSAGE_H_
-
-#include <memory>
-
-#include "core/fxcrt/fx_basic.h"
-#include "core/fxcrt/fx_string.h"
-#include "core/fxcrt/fx_system.h"
-#include "xfa/fwl/core/fwl_error.h"
-
-class CFWL_Widget;
-
-class CFWL_Message {
- public:
-  enum class Type { Key, KillFocus, Mouse, MouseWheel, SetFocus };
-
-  explicit CFWL_Message(Type type);
-  CFWL_Message(Type type, CFWL_Widget* pSrcTarget);
-  CFWL_Message(Type type, CFWL_Widget* pSrcTarget, CFWL_Widget* pDstTarget);
-  virtual ~CFWL_Message();
-
-  virtual std::unique_ptr<CFWL_Message> Clone();
-  Type GetType() const { return m_type; }
-
-  CFWL_Widget* m_pSrcTarget;
-  CFWL_Widget* m_pDstTarget;
-
- private:
-  Type m_type;
-};
-
-
-#endif  // XFA_FWL_CORE_CFWL_MESSAGE_H_