Move AudioDecoderIsac* to its own files

webrtc/modules/audio_coding/codecs/isac/isacfix.gypi

 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'targets': [
     {
       'target_name': 'isac_fix',
       'type': 'static_library',
       'dependencies': [
         '<(webrtc_root)/common_audio/common_audio.gyp:common_audio',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
         'isac_common',
       ],
       'include_dirs': [
         'fix/interface',
         '<(webrtc_root)'
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           'fix/interface',
           '<(webrtc_root)',
         ],
       },
       'sources': [
+        'fix/interface/audio_decoder_isacfix.h',
         'fix/interface/audio_encoder_isacfix.h',
         'fix/interface/isacfix.h',
         'fix/source/arith_routines.c',
         'fix/source/arith_routines_hist.c',
         'fix/source/arith_routines_logist.c',
+        'fix/source/audio_decoder_isacfix.cc',
         'fix/source/audio_encoder_isacfix.cc',
         'fix/source/bandwidth_estimator.c',
         'fix/source/decode.c',
         'fix/source/decode_bwe.c',
         'fix/source/decode_plc.c',
         'fix/source/encode.c',
         'fix/source/entropy_coding.c',
         'fix/source/fft.c',
         'fix/source/filterbank_tables.c',
         'fix/source/filterbanks.c',
         'fix/source/filters.c',
         'fix/source/initialize.c',
+        'fix/source/isac_fix_type.h',
         'fix/source/isacfix.c',
         'fix/source/lattice.c',
         'fix/source/lattice_c.c',
         'fix/source/lpc_masking_model.c',
         'fix/source/lpc_tables.c',
         'fix/source/pitch_estimator.c',
         'fix/source/pitch_estimator_c.c',
         'fix/source/pitch_filter.c',
         'fix/source/pitch_filter_c.c',
         'fix/source/pitch_gain_tables.c',
@@ skipping 82 matching lines @@
             'fix/source/filterbanks_neon.c',
             'fix/source/filters_neon.c',
             'fix/source/lattice_neon.c',
             'fix/source/transform_neon.c',
           ],
         },
       ],
     }],
   ],
 }