Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/theme/cfwl_scrollbartp.cpp

Index: xfa/fwl/theme/cfwl_scrollbartp.cpp
diff --git a/xfa/fwl/theme/cfwl_scrollbartp.cpp b/xfa/fwl/theme/cfwl_scrollbartp.cpp
index b1acd21969cdd071a7b84ea2f3d9a3e05bd7c795..54dfbe5531cf09fa247d3d3ba4f8e8ec2031bf7a 100644
--- a/xfa/fwl/theme/cfwl_scrollbartp.cpp
+++ b/xfa/fwl/theme/cfwl_scrollbartp.cpp
@@ -27,10 +27,8 @@ CFWL_ScrollBarTP::~CFWL_ScrollBarTP() {
   delete m_pThemeData;
 }
 
-FX_BOOL CFWL_ScrollBarTP::IsValidWidget(IFWL_Widget* pWidget) {
-  if (!pWidget)
-    return FALSE;
-  return pWidget->GetClassID() == FWL_CLASSHASH_ScrollBar;
+bool CFWL_ScrollBarTP::IsValidWidget(IFWL_Widget* pWidget) {
+  return pWidget && pWidget->GetClassID() == FWL_Type::ScrollBar;
 }
 void* CFWL_ScrollBarTP::GetCapacity(CFWL_ThemePart* pThemePart,
                                     CFWL_WidgetCapacity dwCapacity) {