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/RTCIceServer.h b/webrtc/api/objc/RTCIceServer.h
index 94e3497..8ca179f 100644
--- a/webrtc/api/objc/RTCIceServer.h
+++ b/webrtc/api/objc/RTCIceServer.h
@@ -16,14 +16,14 @@
@interface RTCIceServer : NSObject
/** URI(s) for this server represented as NSStrings. */
-@property(nonatomic, copy, readonly, nonnull) NSArray *urlStrings;
-// @property(nonatomic, copy, readonly) NSArray<NSString *> *urlStrings;
+@property(nonatomic, readonly, nonnull) NSArray *urlStrings;
+// @property(nonatomic, readonly) NSArray<NSString *> *urlStrings;
/** Username to use if this RTCIceServer object is a TURN server. */
-@property(nonatomic, copy, readonly, nullable) NSString *username;
+@property(nonatomic, readonly, nullable) NSString *username;
/** Credential to use if this RTCIceServer object is a TURN server. */
-@property(nonatomic, copy, readonly, nullable) NSString *credential;
+@property(nonatomic, readonly, nullable) NSString *credential;
- (nonnull instancetype)init NS_UNAVAILABLE;