Moved legacy_encoded_audio_frame into audio_decoder_interface.

webrtc/modules/audio_coding/codecs/pcm16b/pcm16b.gypi

 # Copyright (c) 2011 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': 'pcm16b',
       'type': 'static_library',
       'dependencies': [
         'audio_encoder_interface',
         'audio_decoder_interface',
-        'legacy_encoded_audio_frame',
         'g711',
       ],
       'sources': [
         'audio_decoder_pcm16b.cc',
         'audio_decoder_pcm16b.h',
         'audio_encoder_pcm16b.cc',
         'audio_encoder_pcm16b.h',
         'pcm16b.c',
         'pcm16b.h',
       ],
     },
   ], # targets
 }