Move AudioDecoder and related stuff to the api/ directory

webrtc/modules/audio_coding/neteq/tools/neteq_external_decoder_test.h

 /*
  *  Copyright (c) 2015 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_NETEQ_TOOLS_NETEQ_EXTERNAL_DECODER_TEST_H_
 #define WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_NETEQ_EXTERNAL_DECODER_TEST_H_
 
 #include <memory>
 #include <string>
 
-#include "webrtc/modules/audio_coding/codecs/audio_decoder.h"
+#include "webrtc/api/audio_codecs/audio_decoder.h"
 #include "webrtc/modules/audio_coding/neteq/include/neteq.h"
 #include "webrtc/modules/include/module_common_types.h"
 
 namespace webrtc {
 namespace test {
 // This test class provides a way run NetEQ with an external decoder.
 class NetEqExternalDecoderTest {
  protected:
   static const uint8_t kPayloadType = 95;
   static const int kOutputLengthMs = 10;
@@ skipping 27 matching lines @@
   AudioDecoder* decoder_;
   int sample_rate_hz_;
   size_t channels_;
   std::unique_ptr<NetEq> neteq_;
 };
 
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_NETEQ_EXTERNAL_DECODER_TEST_H_