Remove the GetCaption dataprovider method

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 414678fb60c80b5d9e106f4224ff1dfc7664c88d..a7ae8ce590554cfb8102f15af4ea5dc0f1f33863 100644
--- a/xfa/fwl/core/ifwl_widget.h
+++ b/xfa/fwl/core/ifwl_widget.h
@@ -64,11 +64,7 @@ enum class FWL_Type;
 
 class IFWL_Widget : public IFWL_WidgetDelegate {
  public:
-  class DataProvider {
-   public:
-    virtual void GetCaption(IFWL_Widget* pWidget,
-                            CFX_WideString& wsCaption) = 0;
-  };
+  class DataProvider {};
 
   ~IFWL_Widget() override;