Deprecate RTCRtpFragmentationHeader argument for objc decoders.

Bug: webrtc:6471
Change-Id: Id542360c470ed0ea13b7e963f11bcd50d52c1d43
Reviewed-on: https://webrtc-review.googlesource.com/72442
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Anders Carlsson <andersc@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23036}
diff --git a/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodec.h b/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodec.h
index b30c137..c179b92 100644
--- a/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodec.h
+++ b/sdk/objc/Framework/Headers/WebRTC/RTCVideoCodec.h
@@ -175,13 +175,21 @@
           missingFrames:(BOOL)missingFrames
     fragmentationHeader:(RTCRtpFragmentationHeader *)fragmentationHeader
       codecSpecificInfo:(nullable id<RTCCodecSpecificInfo>)info
-           renderTimeMs:(int64_t)renderTimeMs;
+           renderTimeMs:(int64_t)renderTimeMs
+    DEPRECATED_MSG_ATTRIBUTE("use decode:missingFrames:codecSpecificInfo:renderTimeMs: instead");
 - (NSString *)implementationName;
 
 // TODO(andersc): Make non-optional when `startDecodeWithSettings:numberOfCores:` is removed.
 @optional
 - (NSInteger)startDecodeWithNumberOfCores:(int)numberOfCores;
 
+// TODO(andersc): Make non-optional when `decode:...fragmentationHeader:...` is removed.
+@optional
+- (NSInteger)decode:(RTCEncodedImage *)encodedImage
+        missingFrames:(BOOL)missingFrames
+    codecSpecificInfo:(nullable id<RTCCodecSpecificInfo>)info
+         renderTimeMs:(int64_t)renderTimeMs;
+
 @end
 
 NS_ASSUME_NONNULL_END