Remove dead code in fx_codec_jbig_enc.cpp.

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//testing/test.gni")
 import("pdfium.gni")
 
 config("pdfium_config") {
   cflags = []
   include_dirs = [
@@ skipping 353 matching lines @@
   sources = [
     "core/include/fxcodec/fx_codec.h",
     "core/include/fxcodec/fx_codec_def.h",
     "core/include/fxcodec/fx_codec_flate.h",
     "core/src/fxcodec/codec/codec_int.h",
     "core/src/fxcodec/codec/fx_codec.cpp",
     "core/src/fxcodec/codec/fx_codec_fax.cpp",
     "core/src/fxcodec/codec/fx_codec_flate.cpp",
     "core/src/fxcodec/codec/fx_codec_icc.cpp",
     "core/src/fxcodec/codec/fx_codec_jbig.cpp",
-    "core/src/fxcodec/codec/fx_codec_jbig_enc.cpp",
     "core/src/fxcodec/codec/fx_codec_jpeg.cpp",
     "core/src/fxcodec/codec/fx_codec_jpx_opj.cpp",
     "core/src/fxcodec/jbig2/JBig2_ArithDecoder.cpp",
     "core/src/fxcodec/jbig2/JBig2_ArithDecoder.h",
     "core/src/fxcodec/jbig2/JBig2_ArithIntDecoder.cpp",
     "core/src/fxcodec/jbig2/JBig2_ArithIntDecoder.h",
     "core/src/fxcodec/jbig2/JBig2_BitStream.cpp",
     "core/src/fxcodec/jbig2/JBig2_BitStream.h",
     "core/src/fxcodec/jbig2/JBig2_Context.cpp",
     "core/src/fxcodec/jbig2/JBig2_Context.h",
@@ skipping 391 matching lines @@
       "//v8",
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
   }
   configs += [ ":pdfium_config" ]
 }