Remove RtpPacketToSend::GetHeader as almost unused.

webrtc/modules/rtp_rtcp/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../../webrtc.gni")
 
@@ skipping 100 matching lines @@
     "source/rtp_format_vp9.cc",
     "source/rtp_format_vp9.h",
     "source/rtp_header_extension_map.cc",
     "source/rtp_header_extensions.cc",
     "source/rtp_header_extensions.h",
     "source/rtp_header_parser.cc",
     "source/rtp_packet.cc",
     "source/rtp_packet.h",
     "source/rtp_packet_history.cc",
     "source/rtp_packet_history.h",
+    "source/rtp_packet_received.cc",
     "source/rtp_packet_received.h",
     "source/rtp_packet_to_send.h",
     "source/rtp_payload_registry.cc",
     "source/rtp_receiver_audio.cc",
     "source/rtp_receiver_audio.h",
     "source/rtp_receiver_impl.cc",
     "source/rtp_receiver_impl.h",
     "source/rtp_receiver_strategy.cc",
     "source/rtp_receiver_strategy.h",
     "source/rtp_receiver_video.cc",
@@ skipping 227 matching lines @@
     ]
 
     # TODO(jschuh): bugs.webrtc.org/1348: fix this warning.
     configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
     if (!build_with_chromium && is_clang) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 }