Update API for Objective-C RTCStats.

webrtc/api/objc/RTCStatsReport.h

Index: webrtc/api/objc/RTCStatsReport.h
diff --git a/webrtc/api/objc/RTCMediaConstraints.h b/webrtc/api/objc/RTCStatsReport.h
similarity index 51%
copy from webrtc/api/objc/RTCMediaConstraints.h
copy to webrtc/api/objc/RTCStatsReport.h
index a8ad39142e39449d75e9b7b40bad09fb2c421124..fc66faf2cf7b9e22bdd6211e0f59dc40378603fb 100644
--- a/webrtc/api/objc/RTCMediaConstraints.h
+++ b/webrtc/api/objc/RTCStatsReport.h
@@ -12,16 +12,22 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface RTCMediaConstraints : NSObject
+/** This does not currently conform to the spec. */
+@interface RTCStatsReport : NSObject
 
-- (instancetype)init NS_UNAVAILABLE;
+/** Time since 1970-01-01T00:00:00Z in milliseconds. */
+@property(nonatomic, readonly) CFTimeInterval timestamp;
+
+/** The type of stats held by this object. */
+@property(nonatomic, readonly) NSString *type;
+
+/** The identifier for this object. */
+@property(nonatomic, readonly) NSString *statsId;
 
-/** Initialize with mandatory and/or optional constraints. */
-- (instancetype)initWithMandatoryConstraints:
-    (nullable NSDictionary<NSString *, NSString *> *)mandatory
-                         optionalConstraints:
-    (nullable NSDictionary<NSString *, NSString *> *)optional
-    NS_DESIGNATED_INITIALIZER;
+/** A dictionary holding the actual stats. */
+@property(nonatomic, readonly) NSDictionary<NSString *, NSString *> *values;
+
+- (instancetype)init NS_UNAVAILABLE;
 
 @end