Style fixes in rtcp_packet/

webrtc/modules/rtp_rtcp/source/rtcp_packet/fir.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 12 matching lines @@
 class Fir : public Psfb {
  public:
   static constexpr uint8_t kFeedbackMessageType = 4;
   struct Request {
     Request() : ssrc(0), seq_nr(0) {}
     Request(uint32_t ssrc, uint8_t seq_nr) : ssrc(ssrc), seq_nr(seq_nr) {}
     uint32_t ssrc;
     uint8_t seq_nr;
   };
 
-  Fir() {}
-  ~Fir() override {}
+  Fir();
+  ~Fir() override;
 
   // Parse assumes header is already parsed and validated.
   bool Parse(const CommonHeader& packet);
 
   void AddRequestTo(uint32_t ssrc, uint8_t seq_num) {
     items_.emplace_back(ssrc, seq_num);
   }
   const std::vector<Request>& requests() const { return items_; }
 
- protected:
+  size_t BlockLength() const override;
+
   bool Create(uint8_t* packet,
               size_t* index,
               size_t max_length,
               RtcpPacket::PacketReadyCallback* callback) const override;
 
  private:
   static constexpr size_t kFciLength = 8;
-  size_t BlockLength() const override {
-    return kHeaderLength + kCommonFeedbackLength + kFciLength * items_.size();
-  }
+
   // SSRC of media source is not used in FIR packet. Shadow base functions.
   void SetMediaSsrc(uint32_t ssrc);
   uint32_t media_ssrc() const;
 
   std::vector<Request> items_;
 };
 }  // namespace rtcp
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_FIR_H_