Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/theme/cfwl_carettp.cpp

Index: xfa/fwl/theme/cfwl_carettp.cpp
diff --git a/xfa/fwl/theme/cfwl_carettp.cpp b/xfa/fwl/theme/cfwl_carettp.cpp
index 39ba20bad77b8c4e59c25fe23623cb51480b3454..eb7323131706a696a993f50b7cb1b1c56d90ee93 100644
--- a/xfa/fwl/theme/cfwl_carettp.cpp
+++ b/xfa/fwl/theme/cfwl_carettp.cpp
@@ -15,11 +15,10 @@
 CFWL_CaretTP::CFWL_CaretTP() {}
 CFWL_CaretTP::~CFWL_CaretTP() {}
 
-FX_BOOL CFWL_CaretTP::IsValidWidget(IFWL_Widget* pWidget) {
-  if (!pWidget)
-    return FALSE;
-  return pWidget->GetClassID() == FWL_CLASSHASH_Caret;
+bool CFWL_CaretTP::IsValidWidget(IFWL_Widget* pWidget) {
+  return pWidget && pWidget->GetClassID() == FWL_Type::Caret;
 }
+
 FX_BOOL CFWL_CaretTP::DrawBackground(CFWL_ThemeBackground* pParams) {
   if (!pParams)
     return FALSE;