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diff --git a/third_party/libwebrtc/sdk/objc/native/api/audio_device_module.h b/third_party/libwebrtc/sdk/objc/native/api/audio_device_module.h
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+++ b/third_party/libwebrtc/sdk/objc/native/api/audio_device_module.h
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+/*
+ *  Copyright 2018 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 SDK_OBJC_NATIVE_API_AUDIO_DEVICE_MODULE_H_
+#define SDK_OBJC_NATIVE_API_AUDIO_DEVICE_MODULE_H_
+
+#include <memory>
+
+#include "modules/audio_device/include/audio_device.h"
+
+namespace webrtc {
+
+// If `bypass_voice_processing` is true, WebRTC will attempt to disable hardware
+// audio processing on iOS.
+// Warning: Setting `bypass_voice_processing` will have unpredictable
+// consequences for the audio path in the device. It is not advisable to use in
+// most scenarios.
+rtc::scoped_refptr<AudioDeviceModule> CreateAudioDeviceModule(
+    bool bypass_voice_processing = false);
+
+}  // namespace webrtc
+
+#endif  // SDK_OBJC_NATIVE_API_AUDIO_DEVICE_MODULE_H_