Split fwl/core class pt I.

xfa/fwl/core/ifwl_monthcalendar.cpp

Index: xfa/fwl/core/ifwl_monthcalendar.cpp
diff --git a/xfa/fwl/core/ifwl_monthcalendar.cpp b/xfa/fwl/core/ifwl_monthcalendar.cpp
index 8be738399c07a036589dc6b28493ddc139e573b9..ab9cbc411e168abe3c908b96483cadcbebf4b31e 100644
--- a/xfa/fwl/core/ifwl_monthcalendar.cpp
+++ b/xfa/fwl/core/ifwl_monthcalendar.cpp
@@ -724,8 +724,9 @@ void IFWL_MonthCalendar::GetCapValue() {
 
 void IFWL_MonthCalendar::InitDate() {
   if (m_pProperties->m_pDataProvider) {
-    IFWL_MonthCalendarDP* pDateProv =
-        static_cast<IFWL_MonthCalendarDP*>(m_pProperties->m_pDataProvider);
+    IFWL_MonthCalendar::DataProvider* pDateProv =
+        static_cast<IFWL_MonthCalendar::DataProvider*>(
+            m_pProperties->m_pDataProvider);
     m_iYear = pDateProv->GetCurYear(this);
     m_iMonth = pDateProv->GetCurMonth(this);
     m_iDay = pDateProv->GetCurDay(this);