Remove CPDFSDK_FormFillEnvironment::{Extract,Insert,Replace}Pages().

They are neither called nor actually implemented in a .cpp file.

Change-Id: I5db5568c952316c4efcd4e6d2043326e1a6c7857
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/62571
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
diff --git a/fpdfsdk/cpdfsdk_formfillenvironment.h b/fpdfsdk/cpdfsdk_formfillenvironment.h
index 1b47e22..99f98e7 100644
--- a/fpdfsdk/cpdfsdk_formfillenvironment.h
+++ b/fpdfsdk/cpdfsdk_formfillenvironment.h
@@ -9,7 +9,6 @@
 
 #include <map>
 #include <memory>
-#include <vector>
 
 #include "core/fpdfapi/page/cpdf_occontext.h"
 #include "core/fpdfapi/page/cpdf_page.h"
@@ -76,15 +75,6 @@
   bool KillFocusAnnot(uint32_t nFlag);
   void ClearAllFocusedAnnots();
 
-  bool ExtractPages(const std::vector<uint16_t>& arrExtraPages,
-                    CPDF_Document* pDstDoc);
-  bool InsertPages(int nInsertAt,
-                   const CPDF_Document* pSrcDoc,
-                   const std::vector<uint16_t>& arrSrcPages);
-  bool ReplacePages(int nPage,
-                    const CPDF_Document* pSrcDoc,
-                    const std::vector<uint16_t>& arrSrcPages);
-
   int GetPageCount() const;
   bool GetPermissions(int nFlag) const;