IFWL cleanup in the Combo classes

xfa/fwl/core/ifwl_widget.h

Index: xfa/fwl/core/ifwl_widget.h
diff --git a/xfa/fwl/core/ifwl_widget.h b/xfa/fwl/core/ifwl_widget.h
index d1284b1c92bf75e58d6ad8559bfb7b7f4c3491be..36c587b3eac2a2de31659b7acf17f25cae1472b0 100644
--- a/xfa/fwl/core/ifwl_widget.h
+++ b/xfa/fwl/core/ifwl_widget.h
@@ -111,6 +111,10 @@ class IFWL_Widget : public IFWL_WidgetDelegate {
     return m_pProperties->m_pThemeProvider;
   }
 
+  IFWL_DataProvider* GetDataProvider() const {
+    return m_pProperties->m_pDataProvider;
+  }
+
   void SetDelegate(IFWL_WidgetDelegate* delegate) { m_pDelegate = delegate; }
   IFWL_WidgetDelegate* GetDelegate() {
     return m_pDelegate ? m_pDelegate : this;