Implement scoped_const_refptr template.

webrtc/modules/rtp_rtcp/source/forward_error_correction.cc

 /*
  *  Copyright (c) 2012 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 21 matching lines @@
 const uint8_t kUlpHeaderSizeLBitSet = (2 + kMaskSizeLBitSet);
 
 // ULP header size in bytes (L bit is cleared).
 const uint8_t kUlpHeaderSizeLBitClear = (2 + kMaskSizeLBitClear);
 
 // Transport header size in bytes. Assume UDP/IPv4 as a reasonable minimum.
 const uint8_t kTransportOverhead = 28;
 
 enum { kMaxFecPackets = ForwardErrorCorrection::kMaxMediaPackets };
 
-int32_t ForwardErrorCorrection::Packet::AddRef() {
+int32_t ForwardErrorCorrection::Packet::AddRef() const {
   return ++ref_count_;
 }
 
-int32_t ForwardErrorCorrection::Packet::Release() {
+int32_t ForwardErrorCorrection::Packet::Release() const {
   int32_t ref_count;
   ref_count = --ref_count_;
   if (ref_count == 0)
     delete this;
   return ref_count;
 }
 
 // Used to link media packets to their protecting FEC packets.
 //
 // TODO(holmer): Refactor into a proper class.
@@ skipping 794 matching lines @@
   }
   InsertPackets(received_packet_list, recovered_packet_list);
   AttemptRecover(recovered_packet_list);
   return 0;
 }
 
 size_t ForwardErrorCorrection::PacketOverhead() {
   return kFecHeaderSize + kUlpHeaderSizeLBitSet;
 }
 }  // namespace webrtc