Remove unused parameter in RtpFragmentize

Bug: None
Change-Id: Ic110e3561bc93cb2156240193bc2077e2646ed87
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/161560
Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30118}
diff --git a/AUTHORS b/AUTHORS
index b11ca9a..5f8113f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -77,6 +77,7 @@
 Piasy Xu <xz4215@gmail.com>
 Tomas Popela <tomas.popela@gmail.com>
 Jan Grulich <grulja@gmail.com>
+Jiwon Kim <jwkim0000@gmail.com>
 Eike Rathke <erathke@redhat.com>
 Michel Promonet <michel.promonet.1@gmail.com>
 Min Wang <mingewang@gmail.com>