audio_coding: remove "main" directory

webrtc/modules/audio_coding/main/acm2/acm_neteq_unittest.cc

Index: webrtc/modules/audio_coding/main/acm2/acm_neteq_unittest.cc
diff --git a/webrtc/modules/audio_coding/main/acm2/acm_neteq_unittest.cc b/webrtc/modules/audio_coding/main/acm2/acm_neteq_unittest.cc
deleted file mode 100644
index 607b933deb6bc7e6a75daeddfe488b831f69d750..0000000000000000000000000000000000000000
--- a/webrtc/modules/audio_coding/main/acm2/acm_neteq_unittest.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-/*
- *  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.
- */
-
-// This file contains unit tests for ACM's NetEQ wrapper (class ACMNetEQ).
-
-namespace webrtc {
-
-namespace acm2 {}  // namespace