Change IFWL_Widget to store a single delegate.

xfa/fxfa/app/xfa_ffimageedit.h

Index: xfa/fxfa/app/xfa_ffimageedit.h
diff --git a/xfa/fxfa/app/xfa_ffimageedit.h b/xfa/fxfa/app/xfa_ffimageedit.h
index c8f31e2fc4ad29fd8f3ab0886e82fddc7520b9fc..a895a910c57a536100bc372f43066af4f1815c7b 100644
--- a/xfa/fxfa/app/xfa_ffimageedit.h
+++ b/xfa/fxfa/app/xfa_ffimageedit.h
@@ -21,17 +21,11 @@ class CXFA_FFImageEdit : public CXFA_FFField {
   FX_BOOL LoadWidget() override;
   void UnloadWidget() override;
   FX_BOOL OnLButtonDown(uint32_t dwFlags, FX_FLOAT fx, FX_FLOAT fy) override;
-  void OnProcessMessage(CFWL_Message* pMessage) override;
-  void OnProcessEvent(CFWL_Event* pEvent) override;
-  void OnDrawWidget(CFX_Graphics* pGraphics,
-                    const CFX_Matrix* pMatrix = nullptr) override;
 
  protected:
   void SetFWLRect() override;
   FX_BOOL UpdateFWLData() override;
   FX_BOOL CommitData() override;
-
-  IFWL_WidgetDelegate* m_pOldDelegate;
 };
 
 #endif  // XFA_FXFA_APP_XFA_FFIMAGEEDIT_H_