Remove a few unused variables, functions, and member variables.

core/src/fxcodec/codec/fx_codec_jpeg.cpp

 // 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
 
 #include "../../../include/fxcodec/fx_codec.h"
 #include "../../../include/fxge/fx_dib.h"
 #include "codec_int.h"
 extern "C" {
@@ skipping 55 matching lines @@
     static void _error_do_nothing1(j_common_ptr cinfo, int) {}
 };
 extern "C" {
     static void _error_do_nothing2(j_common_ptr cinfo, char*) {}
 };
 #define JPEG_MARKER_EXIF                (JPEG_APP0 + 1)
 #define JPEG_MARKER_ICC                 (JPEG_APP0 + 2)
 #define JPEG_MARKER_AUTHORTIME  (JPEG_APP0 + 3)
 #define JPEG_MARKER_MAXSIZE     0xFFFF
 #define JPEG_OVERHEAD_LEN       14
-static FX_BOOL _JpegIsIccMarker(jpeg_saved_marker_ptr marker)
-{
-    if (marker->marker == JPEG_MARKER_ICC &&
-            marker->data_length >= JPEG_OVERHEAD_LEN &&
-            (FXSYS_memcmp32(marker->data, "\x49\x43\x43\x5f\x50\x52\x4f\x46\x49\x4c\x45\x00", 12) == 0)) {
-        return TRUE;
-    }
-    return FALSE;
-}
 static  FX_BOOL _JpegEmbedIccProfile(j_compress_ptr cinfo, FX_LPCBYTE icc_buf_ptr, FX_DWORD icc_length)
 {
     if(icc_buf_ptr == NULL || icc_length == 0) {
         return FALSE;
     }
     FX_DWORD icc_segment_size = (JPEG_MARKER_MAXSIZE - 2 - JPEG_OVERHEAD_LEN);
     FX_DWORD icc_segment_num = (icc_length / icc_segment_size) + 1;
     if (icc_segment_num > 255)  {
         return FALSE;
     }
@@ skipping 578 matching lines @@
         return m_pExtProvider->GetAvailInput(pContext, avail_buf_ptr);
     }
     if(avail_buf_ptr != NULL) {
         *avail_buf_ptr = NULL;
         if(((FXJPEG_Context*)pContext)->m_SrcMgr.bytes_in_buffer > 0) {
             *avail_buf_ptr = (FX_LPBYTE)((FXJPEG_Context*)pContext)->m_SrcMgr.next_input_byte;
         }
     }
     return (FX_DWORD)((FXJPEG_Context*)pContext)->m_SrcMgr.bytes_in_buffer;
 }