Move AudioCodingModuleImpl to anonymous namespace in audio_coding_module.cc

webrtc/modules/audio_coding/audio_coding.gypi

 # Copyright (c) 2015 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.
 
 {
   'includes': [
@@ skipping 156 matching lines @@
           'export_dependent_settings': ['webrtc_opus'],
         }],
       ],
       'sources': [
         'acm2/acm_common_defs.h',
         'acm2/acm_receiver.cc',
         'acm2/acm_receiver.h',
         'acm2/acm_resampler.cc',
         'acm2/acm_resampler.h',
         'acm2/audio_coding_module.cc',
-        'acm2/audio_coding_module_impl.cc',
-        'acm2/audio_coding_module_impl.h',
         'acm2/call_statistics.cc',
         'acm2/call_statistics.h',
         'acm2/codec_manager.cc',
         'acm2/codec_manager.h',
         'acm2/initial_delay_manager.cc',
         'acm2/initial_delay_manager.h',
         'include/audio_coding_module.h',
         'include/audio_coding_module_typedefs.h',
       ],
     },
@@ skipping 72 matching lines @@
           'sources': [
              'test/insert_packet_with_timing.cc',
              'test/Channel.cc',
              'test/PCMFile.cc',
            ],
         }, # delay_test
       ],
     }],
   ],
 }