Cleanup some PWL interfaces.

fpdfsdk/formfiller/cffl_textfield.h

Index: fpdfsdk/formfiller/cffl_textfield.h
diff --git a/fpdfsdk/formfiller/cffl_textfield.h b/fpdfsdk/formfiller/cffl_textfield.h
index d7bfc9ee8d985672df6940614e5f09866e00e5be..34968e8fc3f1697dfaf7a2377e2fdd46ecec9397 100644
--- a/fpdfsdk/formfiller/cffl_textfield.h
+++ b/fpdfsdk/formfiller/cffl_textfield.h
@@ -21,9 +21,7 @@ struct FFL_TextFieldState {
   CFX_WideString sValue;
 };
 
-class CFFL_TextField : public CFFL_FormFiller,
-                       public IPWL_FocusHandler,
-                       public IPWL_Edit_Notify {
+class CFFL_TextField : public CFFL_FormFiller, public IPWL_FocusHandler {
  public:
   CFFL_TextField(CPDFDoc_Environment* pApp, CPDFSDK_Annot* pAnnot);
   ~CFFL_TextField() override;
@@ -51,10 +49,6 @@ class CFFL_TextField : public CFFL_FormFiller,
 
   // IPWL_FocusHandler:
   void OnSetFocus(CPWL_Wnd* pWnd) override;
-  void OnKillFocus(CPWL_Wnd* pWnd) override;
-
-  // IPWL_Edit_Notify:
-  void OnAddUndo(CPWL_Edit* pEdit) override;
 
 #ifdef PDF_ENABLE_XFA
   // CFFL_FormFiller: