Remove unused FWL Panel code.

xfa/fwl/core/fwl_panelimp.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/core/fwl_panelimp.h"
-
-#include "xfa/fwl/core/cfwl_widgetimpproperties.h"
-#include "xfa/fwl/core/fwl_noteimp.h"
-#include "xfa/fwl/core/fwl_targetimp.h"
-#include "xfa/fwl/core/fwl_widgetimp.h"
-#include "xfa/fwl/core/fwl_widgetmgrimp.h"
-#include "xfa/fwl/core/ifwl_panel.h"
-
-IFWL_Panel::IFWL_Panel() {}
-
-CFWL_PanelImp::CFWL_PanelImp(const CFWL_WidgetImpProperties& properties,
-                             IFWL_Widget* pOuter)
-    : CFWL_WidgetImp(properties, pOuter) {}
-CFWL_PanelImp::~CFWL_PanelImp() {}
-FWL_ERR CFWL_PanelImp::GetClassName(CFX_WideString& wsClass) const {
-  wsClass = FWL_CLASS_Panel;
-  return FWL_ERR_Succeeded;
-}
-uint32_t CFWL_PanelImp::GetClassID() const {
-  return FWL_CLASSHASH_Panel;
-}
-FWL_ERR CFWL_PanelImp::GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize) {
-  if (!bAutoSize)
-    rect = m_pProperties->m_rtWidget;
-
-  return FWL_ERR_Succeeded;
-}