Remove include only fwl.h and IWYU.

xfa/src/fxfa/src/app/xfa_ffcheckbutton.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/src/fxfa/src/app/xfa_ffcheckbutton.h"
+
+#include "xfa/include/fwl/core/fwl_widgetmgr.h"
+#include "xfa/include/fwl/lightwidget/checkbox.h"
 #include "xfa/src/foxitlib.h"
 #include "xfa/src/fxfa/src/app/xfa_ffapp.h"
-#include "xfa/src/fxfa/src/app/xfa_ffcheckbutton.h"
 #include "xfa/src/fxfa/src/app/xfa_ffdoc.h"
 #include "xfa/src/fxfa/src/app/xfa_ffdocview.h"
 #include "xfa/src/fxfa/src/app/xfa_ffexclgroup.h"
 #include "xfa/src/fxfa/src/app/xfa_fffield.h"
 #include "xfa/src/fxfa/src/app/xfa_ffpageview.h"
 #include "xfa/src/fxfa/src/app/xfa_ffwidget.h"
 
 CXFA_FFCheckButton::CXFA_FFCheckButton(CXFA_FFPageView* pPageView,
                                        CXFA_WidgetAcc* pDataAcc)
     : CXFA_FFField(pPageView, pDataAcc), m_pOldDelegate(NULL) {
@@ skipping 304 matching lines @@
       break;
     }
     default: {}
   }
   return m_pOldDelegate->OnProcessEvent(pEvent);
 }
 FWL_ERR CXFA_FFCheckButton::OnDrawWidget(CFX_Graphics* pGraphics,
                                          const CFX_Matrix* pMatrix) {
   return m_pOldDelegate->OnDrawWidget(pGraphics, pMatrix);
 }