Remove the GetCaption dataprovider method

xfa/fwl/core/ifwl_datetimepicker.cpp

Index: xfa/fwl/core/ifwl_datetimepicker.cpp
diff --git a/xfa/fwl/core/ifwl_datetimepicker.cpp b/xfa/fwl/core/ifwl_datetimepicker.cpp
index b0e0114bce39b449cf97c73b65c38471ad16e1ab..85acbc4d7d7625121b95dbf7f3f8f3fae381f313 100644
--- a/xfa/fwl/core/ifwl_datetimepicker.cpp
+++ b/xfa/fwl/core/ifwl_datetimepicker.cpp
@@ -675,9 +675,6 @@ void IFWL_DateTimePicker::DisForm_OnFocusChanged(CFWL_Message* pMsg,
   Repaint(&rtInvalidate);
 }
 
-void IFWL_DateTimePicker::GetCaption(IFWL_Widget* pWidget,
-                                     CFX_WideString& wsCaption) {}
-
 int32_t IFWL_DateTimePicker::GetCurDay(IFWL_Widget* pWidget) {
   return m_iCurDay;
 }