Minor ObjC header updates.

webrtc/api/objc/RTCDataChannel.h

 /*
  *  Copyright 2015 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.
  */
 
+#import <AvailabilityMacros.h>
 #import <Foundation/Foundation.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
 @interface RTCDataBuffer : NSObject
 
 /** NSData representation of the underlying buffer. */
 @property(nonatomic, readonly) NSData *data;
 
 /** Indicates whether |data| contains UTF-8 or binary data. */
 @property(nonatomic, readonly) BOOL isBinary;
 
 - (instancetype)init NS_UNAVAILABLE;
 
 /**
  * Initialize an RTCDataBuffer from NSData. |isBinary| indicates whether |data|
  * contains UTF-8 or binary data.
  */
 - (instancetype)initWithData:(NSData *)data isBinary:(BOOL)isBinary;
 
 @end
 
 
 @class RTCDataChannel;
-
 @protocol RTCDataChannelDelegate <NSObject>
 
 /** The data channel state changed. */
 - (void)dataChannelDidChangeState:(RTCDataChannel *)dataChannel;
 
 /** The data channel successfully received a data buffer. */
 - (void)dataChannel:(RTCDataChannel *)dataChannel
     didReceiveMessageWithBuffer:(RTCDataBuffer *)buffer;
 
 @optional
-
 /** The data channel's |bufferedAmount| changed. */
 - (void)dataChannel:(RTCDataChannel *)dataChannel
     didChangeBufferedAmount:(uint64_t)amount;
 
 @end
 
 
 /** Represents the state of the data channel. */
 typedef NS_ENUM(NSInteger, RTCDataChannelState) {
-    RTCDataChannelStateConnecting,
-    RTCDataChannelStateOpen,
-    RTCDataChannelStateClosing,
-    RTCDataChannelStateClosed,
+  RTCDataChannelStateConnecting,
+  RTCDataChannelStateOpen,
+  RTCDataChannelStateClosing,
+  RTCDataChannelStateClosed,
 };
 
+
 @interface RTCDataChannel : NSObject
 
 /**
  * A label that can be used to distinguish this data channel from other data
  * channel objects.
  */
 @property(nonatomic, readonly) NSString *label;
 
+/** Whether the data channel can send messages in unreliable mode. */
+@property(nonatomic, readonly) BOOL isReliable DEPRECATED_ATTRIBUTE;
+
 /** Returns whether this data channel is ordered or not. */
 @property(nonatomic, readonly) BOOL isOrdered;
 
+/** Deprecated. Use maxPacketLifeTime. */
+@property(nonatomic, readonly) NSUInteger maxRetransmitTime
+    DEPRECATED_ATTRIBUTE;
+
 /**
  * The length of the time window (in milliseconds) during which transmissions
  * and retransmissions may occur in unreliable mode.
  */
 @property(nonatomic, readonly) uint16_t maxPacketLifeTime;
 
 /**
  * The maximum number of retransmissions that are attempted in unreliable mode.
  */
 @property(nonatomic, readonly) uint16_t maxRetransmits;
 
 /**
  * The name of the sub-protocol used with this data channel, if any. Otherwise
  * this returns an empty string.
  */
 @property(nonatomic, readonly) NSString *protocol;
 
 /**
  * Returns whether this data channel was negotiated by the application or not.
  */
 @property(nonatomic, readonly) BOOL isNegotiated;
 
+/** Deprecated. Use channelId. */
+@property(nonatomic, readonly) NSInteger streamId DEPRECATED_ATTRIBUTE;
+
 /** The identifier for this data channel. */
 @property(nonatomic, readonly) int channelId;
 
 /** The state of the data channel. */
 @property(nonatomic, readonly) RTCDataChannelState readyState;
 
 /**
  * The number of bytes of application data that have been queued using
  * |sendData:| but that have not yet been transmitted to the network.
  */
 @property(nonatomic, readonly) uint64_t bufferedAmount;
 
 /** The delegate for this data channel. */
 @property(nonatomic, weak) id<RTCDataChannelDelegate> delegate;
 
 - (instancetype)init NS_UNAVAILABLE;
 
 /** Closes the data channel. */
 - (void)close;
 
 /** Attempt to send |data| on this data channel's underlying data transport. */
 - (BOOL)sendData:(RTCDataBuffer *)data;
 
 @end
 
 NS_ASSUME_NONNULL_END