Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/fwl_pushbuttonimp.cpp

Index: xfa/fwl/basewidget/fwl_pushbuttonimp.cpp
diff --git a/xfa/fwl/basewidget/fwl_pushbuttonimp.cpp b/xfa/fwl/basewidget/fwl_pushbuttonimp.cpp
index 3b18ad0fa05966731112810ef6ad82b4b0989d1f..77c93f4537ac453e578d48efcf3aa7407c555f9d 100644
--- a/xfa/fwl/basewidget/fwl_pushbuttonimp.cpp
+++ b/xfa/fwl/basewidget/fwl_pushbuttonimp.cpp
@@ -38,20 +38,26 @@ CFWL_PushButtonImp::CFWL_PushButtonImp(
   m_rtClient.Set(0, 0, 0, 0);
   m_rtCaption.Set(0, 0, 0, 0);
 }
+
 CFWL_PushButtonImp::~CFWL_PushButtonImp() {}
+
 FWL_Error CFWL_PushButtonImp::GetClassName(CFX_WideString& wsClass) const {
   wsClass = FWL_CLASS_PushButton;
   return FWL_Error::Succeeded;
 }
-uint32_t CFWL_PushButtonImp::GetClassID() const {
-  return FWL_CLASSHASH_PushButton;
+
+FWL_Type CFWL_PushButtonImp::GetClassID() const {
+  return FWL_Type::PushButton;
 }
+
 FWL_Error CFWL_PushButtonImp::Initialize() {
   if (CFWL_WidgetImp::Initialize() != FWL_Error::Succeeded)
     return FWL_Error::Indefinite;
+
   m_pDelegate = new CFWL_PushButtonImpDelegate(this);
   return FWL_Error::Succeeded;
 }
+
 FWL_Error CFWL_PushButtonImp::Finalize() {
   delete m_pDelegate;
   m_pDelegate = nullptr;