Fix rtcp_sender to support sdes with 31 chunk

webrtc/modules/rtp_rtcp/source/rtcp_packet/sdes.h

 /*
  *  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 10 matching lines @@
 namespace rtcp {
 class CommonHeader;
 // Source Description (SDES) (RFC 3550).
 class Sdes : public RtcpPacket {
  public:
   struct Chunk {
     uint32_t ssrc;
     std::string cname;
   };
   static constexpr uint8_t kPacketType = 202;
+  static constexpr size_t kMaxNumberOfChunks = 0x1f;
 
   Sdes();
   ~Sdes() override;
 
   // Parse assumes header is already parsed and validated.
   bool Parse(const CommonHeader& packet);
 
   bool AddCName(uint32_t ssrc, std::string cname);
 
   const std::vector<Chunk>& chunks() const { return chunks_; }
 
   size_t BlockLength() const override { return block_length_; }
 
  protected:
   bool Create(uint8_t* packet,
               size_t* index,
               size_t max_length,
               RtcpPacket::PacketReadyCallback* callback) const override;
 
  private:
-  static const size_t kMaxNumberOfChunks = 0x1f;
-
   std::vector<Chunk> chunks_;
   size_t block_length_;
 };
 }  // namespace rtcp
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SDES_H_