Remove RichText support from fpdfsdk/fxedit.

fpdfsdk/pdfwindow/PWL_EditCtrl.cpp

Index: fpdfsdk/pdfwindow/PWL_EditCtrl.cpp
diff --git a/fpdfsdk/pdfwindow/PWL_EditCtrl.cpp b/fpdfsdk/pdfwindow/PWL_EditCtrl.cpp
index e74a6d8b32d2613a4023990f14c7da19df85d5da..4802c78fdbc83fb646489817cc8a9b5bd7354553 100644
--- a/fpdfsdk/pdfwindow/PWL_EditCtrl.cpp
+++ b/fpdfsdk/pdfwindow/PWL_EditCtrl.cpp
@@ -566,9 +566,6 @@ void CPWL_EditCtrl::IOnSetCaret(FX_BOOL bVisible,
   OnNotify(this, PNM_SETCARETINFO, (intptr_t)&cInfo, (intptr_t) nullptr);
 }
 
-void CPWL_EditCtrl::IOnCaretChange(const CPVT_SecProps& secProps,
-                                   const CPVT_WordProps& wordProps) {}
-
 void CPWL_EditCtrl::IOnContentChange(const CFX_FloatRect& rcContent) {
   if (IsValid()) {
     if (m_pEditNotify) {