Delete legacy rtp header parser as no longer used

Bug: None
Change-Id: I3c532eee7f2d9e5295874dd538730625c8d423ff
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227086
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Minyue Li <minyue@google.com>
Reviewed-by: Minyue Li <minyue@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34676}

modules/audio_coding/BUILD.gn

@@ -1106,7 +1106,6 @@ rtc_library("neteq_test_tools") {
     "../../rtc_base:rtc_base_approved",
     "../../rtc_base/system:arch",
     "../../test:rtp_test_utils",
-    "../rtp_rtcp",
     "../rtp_rtcp:rtp_rtcp_format",
   ]
   absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]

modules/audio_coding/neteq/tools/rtp_file_source.h

@@ -19,7 +19,6 @@
 #include "absl/types/optional.h"
 #include "modules/audio_coding/neteq/tools/packet_source.h"
 #include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
-#include "modules/rtp_rtcp/source/rtp_utility.h"
 #include "rtc_base/constructor_magic.h"
 
 namespace webrtc {