Move xfa/fwl/core to xfa/fwl.

xfa/fwl/core/cfwl_noteloop.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_NOTELOOP_H_
-#define XFA_FWL_CORE_CFWL_NOTELOOP_H_
-
-class CFWL_Widget;
-
-class CFWL_NoteLoop {
- public:
-  CFWL_NoteLoop();
-  ~CFWL_NoteLoop() {}
-
-  CFWL_Widget* GetForm() const { return m_pForm; }
-  bool ContinueModal() const { return m_bContinueModal; }
-  void EndModalLoop() { m_bContinueModal = false; }
-  void SetMainForm(CFWL_Widget* pForm) { m_pForm = pForm; }
-
- private:
-  CFWL_Widget* m_pForm;
-  bool m_bContinueModal;
-};
-
-#endif  // XFA_FWL_CORE_CFWL_NOTELOOP_H_