Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/theme/cfwl_monthcalendartp.h

Index: xfa/fwl/theme/cfwl_monthcalendartp.h
diff --git a/xfa/fwl/theme/cfwl_monthcalendartp.h b/xfa/fwl/theme/cfwl_monthcalendartp.h
index acc4787f0fd8a70cc136827af8980cb9c9606de8..7ecbb90cf2f11a29aa415410357c076da6ce80c8 100644
--- a/xfa/fwl/theme/cfwl_monthcalendartp.h
+++ b/xfa/fwl/theme/cfwl_monthcalendartp.h
@@ -14,7 +14,8 @@ class CFWL_MonthCalendarTP : public CFWL_WidgetTP {
   CFWL_MonthCalendarTP();
   ~CFWL_MonthCalendarTP() override;
 
-  FX_BOOL IsValidWidget(IFWL_Widget* pWidget) override;
+  // CFWL_WidgetTP
+  bool IsValidWidget(IFWL_Widget* pWidget) override;
   uint32_t SetThemeID(IFWL_Widget* pWidget,
                       uint32_t dwThemeID,
                       FX_BOOL bChildren = TRUE) override;
@@ -37,6 +38,7 @@ class CFWL_MonthCalendarTP : public CFWL_WidgetTP {
   FX_BOOL DrawWeekNumSep(CFWL_ThemeBackground* pParams, CFX_Matrix* pMatrix);
   FWLTHEME_STATE GetState(uint32_t dwFWLStates);
   void SetThemeData(uint32_t dwThemeID);
+
   class MCThemeData {
    public:
     FX_ARGB clrCaption;