Refactor NACK bitrate allocation

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("../../build/webrtc.gni")
 
 source_set("rtp_rtcp") {
   sources = [
     "include/fec_receiver.h",
     "include/receive_statistics.h",
     "include/remote_ntp_time_estimator.h",
     "include/rtp_header_parser.h",
     "include/rtp_payload_registry.h",
     "include/rtp_receiver.h",
     "include/rtp_rtcp.h",
     "include/rtp_rtcp_defines.h",
     "mocks/mock_rtp_rtcp.h",
-    "source/bitrate.cc",
-    "source/bitrate.h",
     "source/byte_io.h",
     "source/dtmf_queue.cc",
     "source/dtmf_queue.h",
     "source/fec_private_tables_bursty.h",
     "source/fec_private_tables_random.h",
     "source/fec_receiver_impl.cc",
     "source/fec_receiver_impl.h",
     "source/forward_error_correction.cc",
     "source/forward_error_correction.h",
     "source/forward_error_correction_internal.cc",
@@ skipping 141 matching lines @@
   # TODO(jschuh): Bug 1348: fix this warning.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   if (is_win) {
     cflags = [
       # TODO(kjellander): Bug 261: fix this warning.
       "/wd4373",  # virtual function override.
     ]
   }
 }