Remove the GetCaption dataprovider method

xfa/fwl/core/cfwl_combobox.cpp

Index: xfa/fwl/core/cfwl_combobox.cpp
diff --git a/xfa/fwl/core/cfwl_combobox.cpp b/xfa/fwl/core/cfwl_combobox.cpp
index f38140821b39ca7f22222c27e636f6d37e4355a5..c1e8a3df67cdeb7b086b90bef87fed4835c7362f 100644
--- a/xfa/fwl/core/cfwl_combobox.cpp
+++ b/xfa/fwl/core/cfwl_combobox.cpp
@@ -156,9 +156,6 @@ void CFWL_ComboBox::EditModifyStylesEx(uint32_t dwStylesExAdded,
   }
 }
 
-void CFWL_ComboBox::GetCaption(IFWL_Widget* pWidget,
-                               CFX_WideString& wsCaption) {}
-
 int32_t CFWL_ComboBox::CountItems(const IFWL_Widget* pWidget) const {
   return m_ItemArray.size();
 }