Remove unused FWL Panel code.

xfa/fwl/basewidget/fwl_formproxyimp.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/fwl/basewidget/fwl_formproxyimp.h"
 
 #include "xfa/fwl/core/fwl_formimp.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
-#include "xfa/fwl/core/fwl_panelimp.h"
 #include "xfa/fwl/core/fwl_targetimp.h"
 #include "xfa/fwl/core/fwl_widgetimp.h"
 
 CFWL_FormProxyImp::CFWL_FormProxyImp(const CFWL_WidgetImpProperties& properties,
                                      IFWL_Widget* pOuter)
     : CFWL_FormImp(properties, pOuter) {}
 CFWL_FormProxyImp::~CFWL_FormProxyImp() {}
 FWL_ERR CFWL_FormProxyImp::GetClassName(CFX_WideString& wsClass) const {
   wsClass = FWL_CLASS_FormProxy;
   return FWL_ERR_Succeeded;
@@ skipping 24 matching lines @@
 FWL_ERR CFWL_FormProxyImp::DrawWidget(CFX_Graphics* pGraphics,
                                       const CFX_Matrix* pMatrix) {
   return FWL_ERR_Succeeded;
 }
 CFWL_FormProxyImpDelegate::CFWL_FormProxyImpDelegate(CFWL_FormProxyImp* pOwner)
     : m_pOwner(pOwner) {}
 int32_t CFWL_FormProxyImpDelegate::OnProcessMessage(CFWL_Message* pMessage) {
   IFWL_WidgetDelegate* pDelegate = m_pOwner->m_pOuter->SetDelegate(NULL);
   return pDelegate->OnProcessMessage(pMessage);
 }