Remove IPDF_TextPage, IPDF_TextPageFind and IPDF_LinkExtract interfaces.

fpdfsdk/fpdf_searchex.cpp

Index: fpdfsdk/fpdf_searchex.cpp
diff --git a/fpdfsdk/fpdf_searchex.cpp b/fpdfsdk/fpdf_searchex.cpp
index ab2baf529c27d08bbe82512129c307b598472104..9c987f2691a0d51e7ae5ae007a77d3b63be991f1 100644
--- a/fpdfsdk/fpdf_searchex.cpp
+++ b/fpdfsdk/fpdf_searchex.cpp
@@ -6,11 +6,12 @@
 
 #include "public/fpdf_searchex.h"
 
-#include "core/fpdftext/include/ipdf_textpage.h"
+#include "core/fpdftext/include/cpdf_textpage.h"
 
 DLLEXPORT int STDCALL
 FPDFText_GetCharIndexFromTextIndex(FPDF_TEXTPAGE text_page, int nTextIndex) {
   if (!text_page)
     return -1;
-  return ((IPDF_TextPage*)text_page)->CharIndexFromTextIndex(nTextIndex);
+  return static_cast<CPDF_TextPage*>(text_page)
+      ->CharIndexFromTextIndex(nTextIndex);
 }