Update API for Objective-C RTCSessionDescription.

webrtc/api/objc/RTCSessionDescription.h

Index: webrtc/api/objc/RTCSessionDescription.h
diff --git a/webrtc/base/objc/NSString+StdString.h b/webrtc/api/objc/RTCSessionDescription.h
similarity index 53%
copy from webrtc/base/objc/NSString+StdString.h
copy to webrtc/api/objc/RTCSessionDescription.h
index 8bf6cc94be0346e398ab1a980af6378f06ccb7a5..8b881d60b2cde714828888de86ae83c086f00e55 100644
--- a/webrtc/base/objc/NSString+StdString.h
+++ b/webrtc/api/objc/RTCSessionDescription.h
@@ -10,16 +10,20 @@
 
 #import <Foundation/Foundation.h>
 
-#include <string>
-
 NS_ASSUME_NONNULL_BEGIN
 
-@interface NSString (StdString)
+@interface RTCSessionDescription : NSObject
+
+/** The type of session description. */
+@property(nonatomic, copy, readonly) NSString *type;

[tkchin_webrtc, 2016/01/05 16:29:18]

copy is technically for setters only. Since we're not changing this to readwrite
in a private interface we can just omit it.

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Progra...

[hjon, 2016/01/05 22:16:20]

Done.

+
+/** The SDP string representation of this session description. */
+@property(nonatomic, copy, readonly) NSString *sdp;
 
-@property(nonatomic, readonly) std::string stdString;
+- (instancetype)init NS_UNAVAILABLE;
 
-+ (std::string)stdStringForString:(NSString *)nsString;
-+ (NSString *)stringForStdString:(const std::string&)stdString;
+/** Initialize a session description with a type and SDP string. */
+- (instancetype)initWithType:(NSString *)type sdp:(NSString *)sdp;
 
 @end