Cleanup unused methods and return values in FWL code.

xfa/fwl/core/ifwl_monthcalendar.h

Index: xfa/fwl/core/ifwl_monthcalendar.h
diff --git a/xfa/fwl/core/ifwl_monthcalendar.h b/xfa/fwl/core/ifwl_monthcalendar.h
index 48b15fef19350da280550a03eac008e85cc3f325..b9376b82c37e3306db3141c49e8cde379610c874 100644
--- a/xfa/fwl/core/ifwl_monthcalendar.h
+++ b/xfa/fwl/core/ifwl_monthcalendar.h
@@ -13,7 +13,6 @@
 #include "xfa/fwl/core/ifwl_dataprovider.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 
-#define FWL_CLASS_MonthCalendar L"FWL_MONTHCALENDAR"
 #define FWL_STYLEEXT_MCD_MultiSelect (1L << 0)
 #define FWL_STYLEEXT_MCD_NoToday (1L << 1)
 #define FWL_STYLEEXT_MCD_NoTodayCircle (1L << 2)
@@ -58,10 +57,9 @@ class IFWL_MonthCalendar : public IFWL_Widget {
   ~IFWL_MonthCalendar() override;
 
   // FWL_WidgetImp
-  FWL_Error GetClassName(CFX_WideString& wsClass) const override;
   FWL_Type GetClassID() const override;
   FWL_Error Initialize() override;
-  FWL_Error Finalize() override;
+  void Finalize() override;
   FWL_Error GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE) override;
   FWL_Error Update() override;
   FWL_Error DrawWidget(CFX_Graphics* pGraphics,