Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/fwl_pushbuttonimp.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_pushbuttonimp.h"
 
 #include "xfa/fde/tto/fde_textout.h"
 #include "xfa/fwl/basewidget/ifwl_pushbutton.h"
@@ skipping 25 matching lines @@
       m_dwTTOStyles(FDE_TTOSTYLE_SingleLine),
       m_iTTOAlign(FDE_TTOALIGNMENT_Center) {
   m_rtClient.Set(0, 0, 0, 0);
   m_rtCaption.Set(0, 0, 0, 0);
 }
 CFWL_PushButtonImp::~CFWL_PushButtonImp() {}
 FWL_ERR CFWL_PushButtonImp::GetClassName(CFX_WideString& wsClass) const {
   wsClass = FWL_CLASS_PushButton;
   return FWL_ERR_Succeeded;
 }
-uint32_t CFWL_PushButtonImp::GetClassID() const {
-  return FWL_CLASSHASH_PushButton;
-}
+
 FWL_ERR CFWL_PushButtonImp::Initialize() {
   if (CFWL_WidgetImp::Initialize() != FWL_ERR_Succeeded)
     return FWL_ERR_Indefinite;
   m_pDelegate = new CFWL_PushButtonImpDelegate(this);
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_PushButtonImp::Finalize() {
   delete m_pDelegate;
   m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
@@ skipping 490 matching lines @@
     CFWL_EvtClick wmClick;
     wmClick.m_pSrcTarget = m_pOwner->m_pInterface;
     m_pOwner->DispatchEvent(&wmClick);
     return;
   }
   if (pMsg->m_dwKeyCode != FWL_VKEY_Tab) {
     return;
   }
   m_pOwner->DispatchKeyEvent(pMsg);
 }