Minor Cleanup of RTCAudioSource.

webrtc/sdk/objc/Framework/Classes/RTCAudioSource.mm

Index: webrtc/sdk/objc/Framework/Classes/RTCAudioSource.mm
diff --git a/webrtc/sdk/objc/Framework/Classes/RTCAudioSource.mm b/webrtc/sdk/objc/Framework/Classes/RTCAudioSource.mm
index 2b9c6b92d27e218459201e81ce8e4e3cdc2c99a2..764445b9b6b707a6043907c06a885ec2bd352de8 100644
--- a/webrtc/sdk/objc/Framework/Classes/RTCAudioSource.mm
+++ b/webrtc/sdk/objc/Framework/Classes/RTCAudioSource.mm
@@ -13,10 +13,10 @@
 #include "webrtc/base/checks.h"
 
 @implementation RTCAudioSource {
-  rtc::scoped_refptr<webrtc::AudioSourceInterface> _nativeAudioSource;
 }
 
 @synthesize volume = _volume;
+@synthesize nativeAudioSource = _nativeAudioSource;
 
 - (instancetype)initWithNativeAudioSource:
     (rtc::scoped_refptr<webrtc::AudioSourceInterface>)nativeAudioSource {
@@ -45,10 +45,4 @@
   _nativeAudioSource->SetVolume(volume);
 }
 
-#pragma mark - Private
-
-- (rtc::scoped_refptr<webrtc::AudioSourceInterface>)nativeAudioSource {
-  return _nativeAudioSource;
-}
-
 @end