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

webrtc/modules/audio_processing/BUILD.gn

 # Copyright (c) 2014 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.
 
 import("//build/config/arm.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 13 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.h",
-    "aec/echo_cancellation_internal.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",
     "agc/histogram.cc",
@@ skipping 248 matching lines @@
       "../../common_audio",
     ]
 
     if (aec_debug_dump) {
       defines = [ "WEBRTC_AEC_DEBUG_DUMP=1" ]
     } else {
       defines = [ "WEBRTC_AEC_DEBUG_DUMP=0" ]
     }
   }
 }