audio_coding: remove "main" directory

webrtc/modules/audio_coding/main/acm2/acm_resampler.h

-/*
- *  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.
- */
-
-#ifndef WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_ACM_RESAMPLER_H_
-#define WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_ACM_RESAMPLER_H_
-
-#include "webrtc/common_audio/resampler/include/push_resampler.h"
-#include "webrtc/typedefs.h"
-
-namespace webrtc {
-namespace acm2 {
-
-class ACMResampler {
- public:
-  ACMResampler();
-  ~ACMResampler();
-
-  int Resample10Msec(const int16_t* in_audio,
-                     int in_freq_hz,
-                     int out_freq_hz,
-                     int num_audio_channels,
-                     size_t out_capacity_samples,
-                     int16_t* out_audio);
-
- private:
-  PushResampler<int16_t> resampler_;
-};
-
-}  // namespace acm2
-}  // namespace webrtc
-
-#endif  // WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_ACM_RESAMPLER_H_