Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/fwl_listboximp.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_listboximp.h"
 
 #include "xfa/fde/tto/fde_textout.h"
 #include "xfa/fwl/basewidget/fwl_comboboximp.h"
@@ skipping 61 matching lines @@
       m_pScrollBarTP(NULL) {
   m_rtClient.Reset();
   m_rtConent.Reset();
   m_rtStatic.Reset();
 }
 CFWL_ListBoxImp::~CFWL_ListBoxImp() {}
 FWL_ERR CFWL_ListBoxImp::GetClassName(CFX_WideString& wsClass) const {
   wsClass = FWL_CLASS_ListBox;
   return FWL_ERR_Succeeded;
 }
-uint32_t CFWL_ListBoxImp::GetClassID() const {
-  return FWL_CLASSHASH_ListBox;
-}
+
 FWL_ERR CFWL_ListBoxImp::Initialize() {
   if (CFWL_WidgetImp::Initialize() != FWL_ERR_Succeeded)
     return FWL_ERR_Indefinite;
   m_pDelegate = new CFWL_ListBoxImpDelegate(this);
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_ListBoxImp::Finalize() {
   if (m_pVertScrollBar) {
     m_pVertScrollBar->Finalize();
   }
@@ skipping 1147 matching lines @@
     pScrollBar->SetTrackPos(fPos);
     m_pOwner->Repaint(&m_pOwner->m_rtClient);
   }
   return TRUE;
 }
 void CFWL_ListBoxImpDelegate::DispatchSelChangedEv() {
   CFWL_EvtLtbSelChanged ev;
   ev.m_pSrcTarget = m_pOwner->m_pInterface;
   m_pOwner->DispatchEvent(&ev);
 }