iOS: Add ability to specify audio constraints.

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCMediaSource.h

Index: webrtc/sdk/objc/Framework/Headers/WebRTC/RTCMediaSource.h
diff --git a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoSource.h b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCMediaSource.h
similarity index 82%
copy from webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoSource.h
copy to webrtc/sdk/objc/Framework/Headers/WebRTC/RTCMediaSource.h
index e234c3e0896f6d086bcf47312234034ffdd45ba7..6cfcb7d2ce8f0cc00b5084a529c98ede2908c96b 100644
--- a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoSource.h
+++ b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCMediaSource.h
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
+ *  Copyright 2016 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
@@ -22,9 +22,9 @@ typedef NS_ENUM(NSInteger, RTCSourceState) {
 NS_ASSUME_NONNULL_BEGIN
 
 RTC_EXPORT
-@interface RTCVideoSource : NSObject
+@interface RTCMediaSource : NSObject
 
-/** The current state of the RTCVideoSource. */
+/** The current state of the RTCMediaSource. */
 @property(nonatomic, readonly) RTCSourceState state;
 
 - (instancetype)init NS_UNAVAILABLE;