Cast: Get rid of frame_id_map

media/cast/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 component("cast") {
   deps = [
     ":sender",
     ":receiver",
   ]
 }
@@ skipping 70 matching lines @@
     "net/rtp/rtp_packetizer.cc",
     "net/rtp/rtp_packetizer.h",
     "net/rtp/rtp_sender.cc",
     "net/rtp/rtp_sender.h",
     "net/udp_transport.cc",
     "net/udp_transport.h",
     "net/rtp/cast_message_builder.cc",
     "net/rtp/cast_message_builder.h",
     "net/rtp/frame_buffer.cc",
     "net/rtp/frame_buffer.h",
-    "net/rtp/frame_id_map.cc",
-    "net/rtp/frame_id_map.h",
     "net/rtp/framer.cc",
     "net/rtp/framer.h",
     "net/rtp/receiver_stats.cc",
     "net/rtp/receiver_stats.h",
     "net/rtp/rtp_parser.cc",
     "net/rtp/rtp_parser.h",
     "net/rtp/rtp_receiver_defines.cc",
     "net/rtp/rtp_receiver_defines.h",
   ]
 
@@ skipping 209 matching lines @@
   sources = [
     "test/utility/udp_proxy_main.cc",
   ]
 
   deps = [
     ":test_support",
     "//base",
     "//net",
   ]
 }