Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/fwl_checkboximp.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_checkboximp.h"
 
 #include <algorithm>
 
@@ skipping 35 matching lines @@
   m_rtClient.Reset();
   m_rtBox.Reset();
   m_rtCaption.Reset();
   m_rtFocus.Reset();
 }
 CFWL_CheckBoxImp::~CFWL_CheckBoxImp() {}
 FWL_ERR CFWL_CheckBoxImp::GetClassName(CFX_WideString& wsClass) const {
   wsClass = FWL_CLASS_CheckBox;
   return FWL_ERR_Succeeded;
 }
-uint32_t CFWL_CheckBoxImp::GetClassID() const {
-  return FWL_CLASSHASH_CheckBox;
-}
+
 FWL_ERR CFWL_CheckBoxImp::Initialize() {
   if (CFWL_WidgetImp::Initialize() != FWL_ERR_Succeeded)
     return FWL_ERR_Indefinite;
   m_pDelegate = new CFWL_CheckBoxImpDelegate(this);
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_CheckBoxImp::Finalize() {
   delete m_pDelegate;
   m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
@@ skipping 487 matching lines @@
 void CFWL_CheckBoxImpDelegate::OnKeyDown(CFWL_MsgKey* pMsg) {
   if (pMsg->m_dwKeyCode == FWL_VKEY_Tab) {
     m_pOwner->DispatchKeyEvent(pMsg);
     return;
   }
   if (pMsg->m_dwKeyCode == FWL_VKEY_Return ||
       pMsg->m_dwKeyCode == FWL_VKEY_Space) {
     m_pOwner->NextStates();
   }
 }