modules: more interface -> include renames

webrtc/modules/audio_conference_mixer/audio_conference_mixer.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': 'audio_conference_mixer',
       'type': 'static_library',
       'dependencies': [
         'audio_processing',
         'webrtc_utility',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
       ],
       'sources': [
-        'interface/audio_conference_mixer.h',
-        'interface/audio_conference_mixer_defines.h',
+        'include/audio_conference_mixer.h',
+        'include/audio_conference_mixer_defines.h',
         'source/audio_frame_manipulator.cc',
         'source/audio_frame_manipulator.h',
         'source/memory_pool.h',
         'source/memory_pool_posix.h',
         'source/memory_pool_win.h',
         'source/audio_conference_mixer_impl.cc',
         'source/audio_conference_mixer_impl.h',
         'source/time_scheduler.cc',
         'source/time_scheduler.h',
       ],
     },
   ], # targets
 }