Changed the delay estimator to be built using C++

webrtc/modules/audio_processing/aecm/aecm_core_mips.cc

 /*
  *  Copyright (c) 2013 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.
  */
 
 #include "webrtc/modules/audio_processing/aecm/aecm_core.h"
 
 #include <assert.h>
 
 #include "webrtc/modules/audio_processing/aecm/echo_control_mobile.h"
-extern "C" {
 #include "webrtc/modules/audio_processing/utility/delay_estimator_wrapper.h"
-}
 
 static const ALIGN8_BEG int16_t WebRtcAecm_kSqrtHanning[] ALIGN8_END = {
   0, 399, 798, 1196, 1594, 1990, 2386, 2780, 3172,
   3562, 3951, 4337, 4720, 5101, 5478, 5853, 6224,
   6591, 6954, 7313, 7668, 8019, 8364, 8705, 9040,
   9370, 9695, 10013, 10326, 10633, 10933, 11227, 11514,
   11795, 12068, 12335, 12594, 12845, 13089, 13325, 13553,
   13773, 13985, 14189, 14384, 14571, 14749, 14918, 15079,
   15231, 15373, 15506, 15631, 15746, 15851, 15947, 16034,
   16111, 16179, 16237, 16286, 16325, 16354, 16373, 16384
@@ skipping 1529 matching lines @@
     sgn = ((int)tt) >> 31;
     out[i].imag = sgn == (int16_t)(tt >> 15) ? (int16_t)tt : (16384 ^ sgn);
   }
   tt = out[PART_LEN].real + uReal[PART_LEN];
   sgn = ((int)tt) >> 31;
   out[PART_LEN].real = sgn == (int16_t)(tt >> 15) ? (int16_t)tt : (16384 ^ sgn);
   tt = out[PART_LEN].imag;
   sgn = ((int)tt) >> 31;
   out[PART_LEN].imag = sgn == (int16_t)(tt >> 15) ? (int16_t)tt : (16384 ^ sgn);
 }