Remove IPDF_TextPage, IPDF_TextPageFind and IPDF_LinkExtract interfaces.

core/fpdftext/include/ipdf_textpagefind.h

-// Copyright 2016 PDFium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
-
-#ifndef CORE_FPDFTEXT_INCLUDE_IPDF_TEXTPAGEFIND_H_
-#define CORE_FPDFTEXT_INCLUDE_IPDF_TEXTPAGEFIND_H_
-
-#include "core/fpdftext/include/ipdf_textpage.h"
-#include "core/fxcrt/include/fx_coordinates.h"
-#include "core/fxcrt/include/fx_string.h"
-
-class IPDF_TextPageFind {
- public:
-  static IPDF_TextPageFind* CreatePageFind(const IPDF_TextPage* pTextPage);
-  virtual ~IPDF_TextPageFind() {}
-
-  virtual FX_BOOL FindFirst(const CFX_WideString& findwhat,
-                            int flags,
-                            int startPos = 0) = 0;
-  virtual FX_BOOL FindNext() = 0;
-  virtual FX_BOOL FindPrev() = 0;
-  virtual void GetRectArray(CFX_RectArray& rects) const = 0;
-  virtual int GetCurOrder() const = 0;
-  virtual int GetMatchedCount() const = 0;
-};
-
-#endif  // CORE_FPDFTEXT_INCLUDE_IPDF_TEXTPAGEFIND_H_