Removed the file echo_cancellation_internal.h and moved the file content to echo_cancellation.h.

webrtc/modules/audio_processing/audio_processing.gypi

 # Copyright (c) 2012 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.
 
 {
   'variables': {
@@ skipping 23 matching lines @@
       ],
       'sources': [
         'aec/aec_core.cc',
         'aec/aec_core.h',
         'aec/aec_core_internal.h',
         'aec/aec_rdft.cc',
         'aec/aec_rdft.h',
         'aec/aec_resampler.cc',
         'aec/aec_resampler.h',
         'aec/echo_cancellation.cc',
-        'aec/echo_cancellation_internal.h',
         'aec/echo_cancellation.h',
         'aecm/aecm_core.cc',
         'aecm/aecm_core.h',
         'aecm/echo_control_mobile.cc',
         'aecm/echo_control_mobile.h',
         'agc/agc.cc',
         'agc/agc.h',
         'agc/agc_manager_direct.cc',
         'agc/agc_manager_direct.h',
         'agc/gain_map_internal.h',
@@ skipping 230 matching lines @@
             'defines': ['WEBRTC_AEC_DEBUG_DUMP=1',],
           }],
           ['aec_debug_dump==0', {
             'defines': ['WEBRTC_AEC_DEBUG_DUMP=0',],
           }],
         ],
       }],
     }],
   ],
 }