Make FlexfecReceiver a concrete class.

webrtc/modules/rtp_rtcp/rtp_rtcp.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
@@ skipping 10 matching lines @@
         'include/flexfec_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',
         'include/ulpfec_receiver.h',
         'source/byte_io.h',
-        'source/flexfec_receiver_impl.cc',
-        'source/flexfec_receiver_impl.h',
+        'source/flexfec_receiver.cc',
         'source/packet_loss_stats.cc',
         'source/packet_loss_stats.h',
         'source/playout_delay_oracle.cc',
         'source/playout_delay_oracle.h',
         'source/receive_statistics_impl.cc',
         'source/receive_statistics_impl.h',
         'source/remote_ntp_time_estimator.cc',
         'source/rtcp_packet.cc',
         'source/rtcp_packet.h',
         'source/rtcp_packet/app.cc',
@@ skipping 134 matching lines @@
               'defines': [ 'BWE_TEST_LOGGING_COMPILE_TIME_ENABLE=1' ],
             }, {
               'defines': [ 'BWE_TEST_LOGGING_COMPILE_TIME_ENABLE=0' ],
             }],
         ],
       # TODO(jschuh): Bug 1348: fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }