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diff --git a/third_party/libwebrtc/api/audio_codecs/opus_audio_decoder_factory.h b/third_party/libwebrtc/api/audio_codecs/opus_audio_decoder_factory.h
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index 0000000000..b4f497f8ff
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+++ b/third_party/libwebrtc/api/audio_codecs/opus_audio_decoder_factory.h
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+/*
+ *  Copyright (c) 2019 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 API_AUDIO_CODECS_OPUS_AUDIO_DECODER_FACTORY_H_
+#define API_AUDIO_CODECS_OPUS_AUDIO_DECODER_FACTORY_H_
+
+#include "api/audio_codecs/audio_decoder_factory.h"
+#include "api/scoped_refptr.h"
+
+namespace webrtc {
+
+// Creates a new factory that can create only Opus audio decoders. Works like
+// CreateAudioDecoderFactory<AudioDecoderOpus>(), but is easier to use and is
+// not inline because it isn't a template.
+rtc::scoped_refptr<AudioDecoderFactory> CreateOpusAudioDecoderFactory();
+
+}  // namespace webrtc
+
+#endif  // API_AUDIO_CODECS_OPUS_AUDIO_DECODER_FACTORY_H_