Remove the VoEDtmf interface.

webrtc/voice_engine/voice_engine.gyp

 # 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.
 
 {
   'includes': [
@@ skipping 19 matching lines @@
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
         '<(webrtc_root)/webrtc.gyp:rtc_event_log',
       ],
       'export_dependent_settings': [
         '<(webrtc_root)/modules/modules.gyp:audio_coding_module',
       ],
       'sources': [
         'include/voe_audio_processing.h',
         'include/voe_base.h',
         'include/voe_codec.h',
-        'include/voe_dtmf.h',
         'include/voe_errors.h',
         'include/voe_external_media.h',
         'include/voe_file.h',
         'include/voe_hardware.h',
         'include/voe_neteq_stats.h',
         'include/voe_network.h',
         'include/voe_rtp_rtcp.h',
         'include/voe_video_sync.h',
         'include/voe_volume_control.h',
         'channel.cc',
@@ skipping 21 matching lines @@
         'transmit_mixer.cc',
         'transmit_mixer.h',
         'utility.cc',
         'utility.h',
         'voe_audio_processing_impl.cc',
         'voe_audio_processing_impl.h',
         'voe_base_impl.cc',
         'voe_base_impl.h',
         'voe_codec_impl.cc',
         'voe_codec_impl.h',
-        'voe_dtmf_impl.cc',
-        'voe_dtmf_impl.h',
         'voe_external_media_impl.cc',
         'voe_external_media_impl.h',
         'voe_file_impl.cc',
         'voe_file_impl.h',
         'voe_hardware_impl.cc',
         'voe_hardware_impl.h',
         'voe_neteq_stats_impl.cc',
         'voe_neteq_stats_impl.h',
         'voe_network_impl.cc',
         'voe_network_impl.h',
@@ skipping 196 matching lines @@
               'sources': [
                 'voe_auto_test.isolate',
               ],
             },
           ],
         }],
       ],  # conditions
     }], # include_tests==1
   ], # conditions
 }