Remove external jpeg provider interface.

pdfium.gyp

 {
   'variables': {
     'pdf_use_skia%': 0,
     'pdf_enable_v8%': 1,
     'conditions': [
       ['OS=="linux"', {
         'bundle_freetype%': 0,
       }, {  # On Android there's no system FreeType. On Windows and Mac, only a
             # few methods are used from it.
         'bundle_freetype%': 1,
@@ skipping 310 matching lines @@
         'third_party/third_party.gyp:fx_lcms2',
         'third_party/third_party.gyp:fx_libjpeg',
         'third_party/third_party.gyp:fx_libopenjpeg',
         'third_party/third_party.gyp:fx_zlib',
       ],
       'ldflags': [ '-L<(PRODUCT_DIR)',],
       'sources': [
         'core/include/fxcodec/fx_codec.h',
         'core/include/fxcodec/fx_codec_def.h',
         'core/include/fxcodec/fx_codec_flate.h',
-        'core/include/fxcodec/fx_codec_provider.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',
@@ skipping 453 matching lines @@
           ],
           'dependencies': [
             '<(DEPTH)/v8/tools/gyp/v8.gyp:v8',
             '<(DEPTH)/v8/tools/gyp/v8.gyp:v8_libplatform',
           ],
         }],
       ],
     },
   ],
 }