Remove webrtc/sound/ subdir.

webrtc/media/media.gyp

 # Copyright (c) 2016 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': [ '../build/common.gypi', ],
   'targets': [
     {
       'target_name': 'rtc_media',
       'type': 'static_library',
       'dependencies': [
         '<(webrtc_root)/base/base.gyp:rtc_base_approved',
         '<(webrtc_root)/common.gyp:webrtc_common',
         '<(webrtc_root)/modules/modules.gyp:video_render_module',
         '<(webrtc_root)/webrtc.gyp:webrtc',
         '<(webrtc_root)/voice_engine/voice_engine.gyp:voice_engine',
-        '<(webrtc_root)/sound/sound.gyp:rtc_sound',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:metrics_default',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
         '<(webrtc_root)/libjingle/xmllite/xmllite.gyp:rtc_xmllite',
         '<(webrtc_root)/libjingle/xmpp/xmpp.gyp:rtc_xmpp',
         '<(webrtc_root)/p2p/p2p.gyp:rtc_p2p',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '<(libyuv_dir)/include',
         ],
@@ skipping 177 matching lines @@
         }],
         ['OS=="ios" or (OS=="mac" and target_arch!="ia32")', {
           'defines': [
             'CARBON_DEPRECATED=YES',
           ],
         }],
       ],
     },  # target rtc_media
   ],  # targets.
 }