Remove unused widget handler overrides

fpdfsdk/cpdfsdk_xfawidgethandler.h

Index: fpdfsdk/cpdfsdk_xfawidgethandler.h
diff --git a/fpdfsdk/cpdfsdk_xfawidgethandler.h b/fpdfsdk/cpdfsdk_xfawidgethandler.h
index 5ec96188fc3c479898c92f28f01770ea34fd9d22..c395a056001c79a1e469be3767ed2d705253512e 100644
--- a/fpdfsdk/cpdfsdk_xfawidgethandler.h
+++ b/fpdfsdk/cpdfsdk_xfawidgethandler.h
@@ -30,7 +30,6 @@ class CPDFSDK_XFAWidgetHandler : public IPDFSDK_AnnotHandler {
   CPDFSDK_Annot* NewAnnot(CXFA_FFWidget* pAnnot,
                           CPDFSDK_PageView* pPage) override;
   void ReleaseAnnot(CPDFSDK_Annot* pAnnot) override;
-  void DeleteAnnot(CPDFSDK_Annot* pAnnot) override;
   CFX_FloatRect GetViewBBox(CPDFSDK_PageView* pPageView,
                             CPDFSDK_Annot* pAnnot) override;
   FX_BOOL HitTest(CPDFSDK_PageView* pPageView,
@@ -41,10 +40,7 @@ class CPDFSDK_XFAWidgetHandler : public IPDFSDK_AnnotHandler {
               CFX_RenderDevice* pDevice,
               CFX_Matrix* pUser2Device,
               bool bDrawAnnots) override;
-  void OnCreate(CPDFSDK_Annot* pAnnot) override;
   void OnLoad(CPDFSDK_Annot* pAnnot) override;
-  void OnDelete(CPDFSDK_Annot* pAnnot) override;
-  void OnRelease(CPDFSDK_Annot* pAnnot) override;
   void OnMouseEnter(CPDFSDK_PageView* pPageView,
                     CPDFSDK_Annot::ObservedPtr* pAnnot,
                     uint32_t nFlag) override;
@@ -89,8 +85,6 @@ class CPDFSDK_XFAWidgetHandler : public IPDFSDK_AnnotHandler {
                  uint32_t nFlags) override;
   FX_BOOL OnKeyDown(CPDFSDK_Annot* pAnnot, int nKeyCode, int nFlag) override;
   FX_BOOL OnKeyUp(CPDFSDK_Annot* pAnnot, int nKeyCode, int nFlag) override;
-  void OnDeSelected(CPDFSDK_Annot* pAnnot) override;
-  void OnSelected(CPDFSDK_Annot* pAnnot) override;
   FX_BOOL OnSetFocus(CPDFSDK_Annot::ObservedPtr* pAnnot,
                      uint32_t nFlag) override;
   FX_BOOL OnKillFocus(CPDFSDK_Annot::ObservedPtr* pAnnot,