Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/fwl_scrollbarimp.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_scrollbarimp.h"
 
 #include "xfa/fwl/basewidget/ifwl_scrollbar.h"
 #include "xfa/fwl/core/cfwl_message.h"
@@ skipping 85 matching lines @@
   m_rtMinBtn.Reset();
   m_rtMaxBtn.Reset();
   m_rtMinTrack.Reset();
   m_rtMaxTrack.Reset();
 }
 CFWL_ScrollBarImp::~CFWL_ScrollBarImp() {}
 FWL_ERR CFWL_ScrollBarImp::GetClassName(CFX_WideString& wsClass) const {
   wsClass = FWL_CLASS_ScrollBar;
   return FWL_ERR_Succeeded;
 }
-uint32_t CFWL_ScrollBarImp::GetClassID() const {
-  return FWL_CLASSHASH_ScrollBar;
-}
+
 FWL_ERR CFWL_ScrollBarImp::Initialize() {
   if (CFWL_WidgetImp::Initialize() != FWL_ERR_Succeeded)
     return FWL_ERR_Indefinite;
   m_pDelegate = new CFWL_ScrollBarImpDelegate(this);
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_ScrollBarImp::Finalize() {
   delete m_pDelegate;
   m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
@@ skipping 686 matching lines @@
 }
 void CFWL_ScrollBarImpDelegate::DoMouseHover(int32_t iItem,
                                              const CFX_RectF& rtItem,
                                              int32_t& iState) {
   if (iState == CFWL_PartState_Hovered) {
     return;
   }
   iState = CFWL_PartState_Hovered;
   m_pOwner->Repaint(&rtItem);
 }