Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/fwl_barcodeimp.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_barcodeimp.h"
 
 #include "xfa/fwl/basewidget/fwl_editimp.h"
 #include "xfa/fwl/basewidget/fxmath_barcodeimp.h"
@@ skipping 24 matching lines @@
       m_pBarcodeEngine(NULL),
       m_dwStatus(0),
       m_type(BC_UNKNOWN) {}
 CFWL_BarcodeImp::~CFWL_BarcodeImp() {
   ReleaseBarcodeEngine();
 }
 FWL_ERR CFWL_BarcodeImp::GetClassName(CFX_WideString& wsClass) const {
   wsClass = FWL_CLASS_Barcode;
   return FWL_ERR_Succeeded;
 }
-uint32_t CFWL_BarcodeImp::GetClassID() const {
-  return FWL_CLASSHASH_Barcode;
-}
+
 FWL_ERR CFWL_BarcodeImp::Initialize() {
   if (!m_pDelegate) {
     m_pDelegate = new CFWL_BarcodeImpDelegate(this);
   }
   if (CFWL_EditImp::Initialize() != FWL_ERR_Succeeded)
     return FWL_ERR_Indefinite;
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_BarcodeImp::Finalize() {
   delete m_pDelegate;
@@ skipping 163 matching lines @@
     : CFWL_EditImpDelegate(pOwner) {}
 
 FWL_ERR CFWL_BarcodeImpDelegate::OnProcessEvent(CFWL_Event* pEvent) {
   if (pEvent->GetClassID() == CFWL_EventType::TextChanged) {
     CFWL_BarcodeImp* pOwner = static_cast<CFWL_BarcodeImp*>(m_pOwner);
     pOwner->ReleaseBarcodeEngine();
     pOwner->m_dwStatus = XFA_BCS_NeedUpdate;
   }
   return CFWL_EditImpDelegate::OnProcessEvent(pEvent);
 }