Move xfa/fwl/core to xfa/fwl.

xfa/fwl/core/cfwl_msgmouse.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_MSGMOUSE_H_
-#define XFA_FWL_CORE_CFWL_MSGMOUSE_H_
-
-#include <memory>
-
-#include "xfa/fwl/core/cfwl_message.h"
-
-enum class FWL_MouseCommand {
-  LeftButtonDown,
-  LeftButtonUp,
-  LeftButtonDblClk,
-  RightButtonDown,
-  RightButtonUp,
-  RightButtonDblClk,
-  Move,
-  Enter,
-  Leave,
-  Hover
-};
-
-class CFWL_MsgMouse : public CFWL_Message {
- public:
-  CFWL_MsgMouse(CFWL_Widget* pSrcTarget, CFWL_Widget* pDstTarget);
-  ~CFWL_MsgMouse() override;
-
-  // CFWL_Message
-  std::unique_ptr<CFWL_Message> Clone() override;
-
-  FX_FLOAT m_fx;
-  FX_FLOAT m_fy;
-  uint32_t m_dwFlags;
-  FWL_MouseCommand m_dwCmd;
-};
-
-#endif  // XFA_FWL_CORE_CFWL_MSGMOUSE_H_