Delete objc RTCRtpFragmentationHeader

Bug: webrtc:6471
Change-Id: I1d5f4fc2484c4f37ff8556ac660a1c0d070875f6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/191443
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32640}
diff --git a/sdk/objc/base/RTCVideoEncoder.h b/sdk/objc/base/RTCVideoEncoder.h
index 7d1a7af..29e8a89 100644
--- a/sdk/objc/base/RTCVideoEncoder.h
+++ b/sdk/objc/base/RTCVideoEncoder.h
@@ -13,7 +13,6 @@
 #import "RTCCodecSpecificInfo.h"
 #import "RTCEncodedImage.h"
 #import "RTCMacros.h"
-#import "RTCRtpFragmentationHeader.h"
 #import "RTCVideoEncoderQpThresholds.h"
 #import "RTCVideoEncoderSettings.h"
 #import "RTCVideoFrame.h"
@@ -22,8 +21,7 @@
 
 /** Callback block for encoder. */
 typedef BOOL (^RTCVideoEncoderCallback)(RTC_OBJC_TYPE(RTCEncodedImage) * frame,
-                                        id<RTC_OBJC_TYPE(RTCCodecSpecificInfo)> info,
-                                        RTC_OBJC_TYPE(RTCRtpFragmentationHeader) * header);
+                                        id<RTC_OBJC_TYPE(RTCCodecSpecificInfo)> info);
 
 /** Protocol for encoder implementations. */
 RTC_OBJC_EXPORT