Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/fwl_comboboximp.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_comboboximp.h"
 
 #include "xfa/fde/tto/fde_textout.h"
 #include "xfa/fee/fde_txtedtengine.h"
@@ skipping 470 matching lines @@
       m_bNeedShowList(FALSE) {
   m_rtClient.Reset();
   m_rtBtn.Reset();
   m_rtHandler.Reset();
 }
 CFWL_ComboBoxImp::~CFWL_ComboBoxImp() {}
 FWL_ERR CFWL_ComboBoxImp::GetClassName(CFX_WideString& wsClass) const {
   wsClass = FWL_CLASS_ComboBox;
   return FWL_ERR_Succeeded;
 }
-uint32_t CFWL_ComboBoxImp::GetClassID() const {
-  return FWL_CLASSHASH_ComboBox;
-}
+
 FWL_ERR CFWL_ComboBoxImp::Initialize() {
   if (m_pWidgetMgr->IsFormDisabled()) {
     return DisForm_Initialize();
   }
   if (CFWL_WidgetImp::Initialize() != FWL_ERR_Succeeded)
     return FWL_WGTSTATE_Invisible;  // Probably a bug; not a FWL_ERR_ value.
   m_pDelegate = new CFWL_ComboBoxImpDelegate(this);
   CFWL_WidgetImpProperties prop;
   prop.m_pThemeProvider = m_pProperties->m_pThemeProvider;
   prop.m_dwStyles |= FWL_WGTSTYLE_Border | FWL_WGTSTYLE_VScroll;
@@ skipping 1339 matching lines @@
   m_pComboBox->ShowDropList(FALSE);
 }
 void CFWL_ComboProxyImpDelegate::OnFocusChanged(CFWL_MsgKillFocus* pMsg,
                                                 FX_BOOL bSet) {
   if (!bSet) {
     if (pMsg->m_pSetFocus == NULL) {
       m_pComboBox->ShowDropList(FALSE);
     }
   }
 }