Revert of Parse FlexFEC RTP headers in Call and add integration with BWE.

webrtc/modules/rtp_rtcp/source/rtp_packet.cc

 /*
  *  Copyright (c) 2016 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 68 matching lines @@
 bool Packet::Parse(const uint8_t* buffer, size_t buffer_size) {
   if (!ParseBuffer(buffer, buffer_size)) {
     Clear();
     return false;
   }
   buffer_.SetData(buffer, buffer_size);
   RTC_DCHECK_EQ(size(), buffer_size);
   return true;
 }
 
-bool Packet::Parse(rtc::ArrayView<const uint8_t> packet) {
-  return Parse(packet.data(), packet.size());
-}
-
 bool Packet::Parse(rtc::CopyOnWriteBuffer buffer) {
   if (!ParseBuffer(buffer.cdata(), buffer.size())) {
     Clear();
     return false;
   }
   size_t buffer_size = buffer.size();
   buffer_ = std::move(buffer);
   RTC_DCHECK_EQ(size(), buffer_size);
   return true;
 }
@@ skipping 445 matching lines @@
 uint8_t* Packet::WriteAt(size_t offset) {
   return buffer_.data() + offset;
 }
 
 void Packet::WriteAt(size_t offset, uint8_t byte) {
   buffer_.data()[offset] = byte;
 }
 
 }  // namespace rtp
 }  // namespace webrtc