Send RTCP packets via RtcpPacket callback

webrtc/modules/rtp_rtcp/source/rtcp_packet.cc

 /*
  *  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.
  */
 
@@ skipping 667 matching lines @@
    private:
     bool called_;
     RawPacket* const packet_;
   } verifier(packet.get());
   CreateAndAddAppended(packet->MutableBuffer(), &length, packet->BufferLength(),
                        &verifier);
   OnBufferFull(packet->MutableBuffer(), &length, &verifier);
   return packet;
 }
 
-bool RtcpPacket::Build(PacketReadyCallback* callback) const {
-  uint8_t buffer[IP_PACKET_SIZE];
-  return BuildExternalBuffer(buffer, IP_PACKET_SIZE, callback);
-}
-
 bool RtcpPacket::BuildExternalBuffer(uint8_t* buffer,
                                      size_t max_length,
                                      PacketReadyCallback* callback) const {
   size_t index = 0;
   if (!CreateAndAddAppended(buffer, &index, max_length, callback))
     return false;
   return OnBufferFull(buffer, &index, callback);
 }
 
 bool RtcpPacket::CreateAndAddAppended(uint8_t* packet,
@@ skipping 517 matching lines @@
   return length_;
 }
 
 void RawPacket::SetLength(size_t length) {
   assert(length <= buffer_length_);
   length_ = length;
 }
 
 }  // namespace rtcp
 }  // namespace webrtc