Remove xfa/src/fwl/src and move code up a level.

xfa/src/fwl/lightwidget/datetimepicker.cpp

 // Copyright 2014 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
 
 #include "xfa/include/fwl/lightwidget/datetimepicker.h"
 
 #include <memory>
 
@@ skipping 124 matching lines @@
   return static_cast<IFWL_DateTimePicker*>(m_pIface)->GetBBox(rect);
 }
 FWL_ERR CFWL_DateTimePicker::SetEditLimit(int32_t nLimit) {
   return static_cast<IFWL_DateTimePicker*>(m_pIface)->SetEditLimit(nLimit);
 }
 FWL_ERR CFWL_DateTimePicker::ModifyEditStylesEx(FX_DWORD dwStylesExAdded,
                                                 FX_DWORD dwStylesExRemoved) {
   return static_cast<IFWL_DateTimePicker*>(m_pIface)
       ->ModifyEditStylesEx(dwStylesExAdded, dwStylesExRemoved);
 }