Tweaks for new Objective-C API.
BUG=
Review URL: https://codereview.webrtc.org/1696673003
Cr-Commit-Position: refs/heads/master@{#11872}
diff --git a/webrtc/api/objc/RTCMediaStreamTrack.h b/webrtc/api/objc/RTCMediaStreamTrack.h
index beb48d3..7883843 100644
--- a/webrtc/api/objc/RTCMediaStreamTrack.h
+++ b/webrtc/api/objc/RTCMediaStreamTrack.h
@@ -35,7 +35,7 @@
@property(nonatomic, readonly) NSString *trackId;
/** The enabled state of the track. */
-@property(nonatomic) BOOL isEnabled;
+@property(nonatomic, assign) BOOL isEnabled;
/** The state of the track. */
@property(nonatomic, readonly) RTCMediaStreamTrackState readyState;