iOS audio session isInterrupted flag does not get reset correctly:

webrtc/modules/audio_device/ios/audio_device_ios.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_DEVICE_IOS_AUDIO_DEVICE_IOS_H_
 #define WEBRTC_MODULES_AUDIO_DEVICE_IOS_AUDIO_DEVICE_IOS_H_
 
 #include <memory>
 
 #include "WebRTC/RTCMacros.h"
+#include "webrtc/base/gtest_prod_util.h"
 #include "webrtc/base/thread.h"
 #include "webrtc/base/thread_checker.h"
 #include "webrtc/modules/audio_device/audio_device_generic.h"
 #include "webrtc/modules/audio_device/ios/audio_session_observer.h"
 #include "webrtc/modules/audio_device/ios/voice_processing_audio_unit.h"
 
 RTC_FWD_DECL_OBJC_CLASS(RTCAudioSessionDelegateAdapter);
 
 namespace webrtc {
 
@@ skipping 258 matching lines @@
   bool audio_is_initialized_;
 
   // Set to true if audio session is interrupted, false otherwise.
   bool is_interrupted_;
 
   // Audio interruption observer instance.
   RTCAudioSessionDelegateAdapter* audio_session_observer_;
 
   // Set to true if we've activated the audio session.
   bool has_configured_session_;
+
+  // Exposes private members for testing purposes only.
+  FRIEND_TEST_ALL_PREFIXES(AudioDeviceTest, testInterruptedAudioSession);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_DEVICE_IOS_AUDIO_DEVICE_IOS_H_