Remove the unused IFX_StreamRead::SetRange() mechanism.

core/include/fxcrt/fx_stream.h

 // Copyright 2014 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_INCLUDE_FXCRT_FX_STREAM_H_
 #define CORE_INCLUDE_FXCRT_FX_STREAM_H_
 
 #include "fx_string.h"
@@ skipping 82 matching lines @@
 class IFX_FileRead : IFX_StreamRead {
  public:
   virtual void Release() = 0;
 
   virtual FX_FILESIZE GetSize() = 0;
 
   virtual FX_BOOL IsEOF() { return FALSE; }
 
   virtual FX_FILESIZE GetPosition() { return 0; }
 
-  virtual FX_BOOL SetRange(FX_FILESIZE offset, FX_FILESIZE size) {
-    return FALSE;
-  }
-
-  virtual void ClearRange() {}
-
   virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) = 0;
 
   virtual size_t ReadBlock(void* buffer, size_t size) { return 0; }
 };
 IFX_FileRead* FX_CreateFileRead(const FX_CHAR* filename);
 IFX_FileRead* FX_CreateFileRead(const FX_WCHAR* filename);
 class IFX_FileStream : public IFX_FileRead, public IFX_FileWrite {
  public:
   virtual IFX_FileStream* Retain() = 0;
 
@@ skipping 51 matching lines @@
   virtual FX_BOOL ReadNextBlock(FX_BOOL bRestart = FALSE) = 0;
 
   virtual const uint8_t* GetBlockBuffer() = 0;
 
   virtual size_t GetBlockSize() = 0;
 
   virtual FX_FILESIZE GetBlockOffset() = 0;
 };
 
 #endif  // CORE_INCLUDE_FXCRT_FX_STREAM_H_