Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/fwl_pictureboximp.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_pictureboximp.h"
 
 #include "xfa/fwl/core/fwl_noteimp.h"
 #include "xfa/fwl/core/fwl_widgetimp.h"
@@ skipping 21 matching lines @@
       m_bButton(FALSE) {
   m_rtClient.Reset();
   m_rtImage.Reset();
   m_matrix.SetIdentity();
 }
 CFWL_PictureBoxImp::~CFWL_PictureBoxImp() {}
 FWL_ERR CFWL_PictureBoxImp::GetClassName(CFX_WideString& wsClass) const {
   wsClass = FWL_CLASS_PictureBox;
   return FWL_ERR_Succeeded;
 }
-uint32_t CFWL_PictureBoxImp::GetClassID() const {
-  return FWL_CLASSHASH_PictureBox;
-}
+
 FWL_ERR CFWL_PictureBoxImp::Initialize() {
   if (CFWL_WidgetImp::Initialize() != FWL_ERR_Succeeded)
     return FWL_ERR_Indefinite;
   m_pDelegate = new CFWL_PictureBoxImpDelegate(this);
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_PictureBoxImp::Finalize() {
   delete m_pDelegate;
   m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
@@ skipping 86 matching lines @@
   }
   return FALSE;
 }
 CFWL_PictureBoxImpDelegate::CFWL_PictureBoxImpDelegate(
     CFWL_PictureBoxImp* pOwner)
     : m_pOwner(pOwner) {}
 FWL_ERR CFWL_PictureBoxImpDelegate::OnDrawWidget(CFX_Graphics* pGraphics,
                                                  const CFX_Matrix* pMatrix) {
   return m_pOwner->DrawWidget(pGraphics, pMatrix);
 }