Remove webrtc/sound/ subdir.

webrtc/build/merge_libs.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': ['common.gypi',],
   'variables': {
     'merge_libs_dependencies': [
     ],
   },
   'targets': [
     {
       'target_name': 'no_op',
       'type': 'executable',
       'dependencies': [
         '<@(merge_libs_dependencies)',
         '../webrtc.gyp:webrtc',
-        '../sound/sound.gyp:rtc_sound',
         '../libjingle/xmllite/xmllite.gyp:rtc_xmllite',
         '../libjingle/xmpp/xmpp.gyp:rtc_xmpp',
         '../p2p/p2p.gyp:rtc_p2p',
       ],
       'sources': ['no_op.cc',],
     },
     {
       'target_name': 'merged_lib',
       'type': 'none',
       'dependencies': [
@@ skipping 10 matching lines @@
           'outputs': ['<(output_lib)'],
           'action': ['python',
                      'merge_libs.py',
                      '<(PRODUCT_DIR)',
                      '<(output_lib)',],
         },
       ],
     },
   ],
 }