Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/theme/cfwl_comboboxtp.cpp

Index: xfa/fwl/theme/cfwl_comboboxtp.cpp
diff --git a/xfa/fwl/theme/cfwl_comboboxtp.cpp b/xfa/fwl/theme/cfwl_comboboxtp.cpp
index b02caf8a3ec547f5c49f3a1a25ba7e38ab8fe8c7..92f2296105727a14169c82aaf2902fb99cc0c1fc 100644
--- a/xfa/fwl/theme/cfwl_comboboxtp.cpp
+++ b/xfa/fwl/theme/cfwl_comboboxtp.cpp
@@ -22,12 +22,13 @@ const float kComboFormHandler = 8.0f;
 CFWL_ComboBoxTP::CFWL_ComboBoxTP() {
   m_dwThemeID = 0;
 }
+
 CFWL_ComboBoxTP::~CFWL_ComboBoxTP() {}
-FX_BOOL CFWL_ComboBoxTP::IsValidWidget(IFWL_Widget* pWidget) {
-  if (!pWidget)
-    return FALSE;
-  return pWidget->GetClassID() == FWL_CLASSHASH_ComboBox;
+
+bool CFWL_ComboBoxTP::IsValidWidget(IFWL_Widget* pWidget) {
+  return pWidget && pWidget->GetClassID() == FWL_Type::ComboBox;
 }
+
 FX_BOOL CFWL_ComboBoxTP::DrawBackground(CFWL_ThemeBackground* pParams) {
   if (!pParams)
     return FALSE;