Merge delegates into IFWL_* classes.

xfa/fwl/core/ifwl_datetimeedit.h

Index: xfa/fwl/core/ifwl_datetimeedit.h
diff --git a/xfa/fwl/core/ifwl_datetimeedit.h b/xfa/fwl/core/ifwl_datetimeedit.h
index 39dd3718ac134aa11d7eb4b353033745d45d1925..84ff7e7ee7283657cdbe2b65bd5c93c8dd0723a9 100644
--- a/xfa/fwl/core/ifwl_datetimeedit.h
+++ b/xfa/fwl/core/ifwl_datetimeedit.h
@@ -19,18 +19,9 @@ class IFWL_DateTimeEdit : public IFWL_Edit {
                     const CFWL_WidgetImpProperties& properties,
                     IFWL_Widget* pOuter);
 
- protected:
-  friend class CFWL_DateTimeEditImpDelegate;
-};
-
-class CFWL_DateTimeEditImpDelegate : public CFWL_EditImpDelegate {
- public:
-  CFWL_DateTimeEditImpDelegate(IFWL_DateTimeEdit* pOwner);
+  // IFWL_Edit.
   void OnProcessMessage(CFWL_Message* pMessage) override;
 
- protected:
-  IFWL_DateTimeEdit* m_pOwner;
-
  private:
   void DisForm_OnProcessMessage(CFWL_Message* pMessage);
 };