Stop using deprecated constraints-based version of CreateAudioSource.

webrtc/api/mediaconstraintsinterface.h

 /*
  *  Copyright 2013 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.
  */
 
@@ skipping 123 matching lines @@
 bool FindConstraint(const MediaConstraintsInterface* constraints,
                     const std::string& key,
                     int* value,
                     size_t* mandatory_constraints);
 
 // Copy all relevant constraints into an RTCConfiguration object.
 void CopyConstraintsIntoRtcConfiguration(
     const MediaConstraintsInterface* constraints,
     PeerConnectionInterface::RTCConfiguration* configuration);
 
+// Copy all relevant constraints into an AudioOptions object.
+void CopyConstraintsIntoAudioOptions(
+    const MediaConstraintsInterface* constraints,
+    cricket::AudioOptions* options);
+
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_MEDIACONSTRAINTSINTERFACE_H_