Style fixes in rtcp_packet/

webrtc/modules/rtp_rtcp/source/rtcp_packet/compound_packet.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.
  *
  */
 
 #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_COMPOUND_PACKET_H_
 #define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_COMPOUND_PACKET_H_
 
 #include <vector>
 
 #include "webrtc/base/basictypes.h"
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet.h"
 
 namespace webrtc {
 namespace rtcp {
 
 class CompoundPacket : public RtcpPacket {
  public:
-  CompoundPacket() {}
-  ~CompoundPacket() override {}
+  CompoundPacket();
+  ~CompoundPacket() override;
 
   void Append(RtcpPacket* packet);
 
   // Size of this packet in bytes (i.e. total size of nested packets).
   size_t BlockLength() const override;
   // Returns true if all calls to Create succeeded.
   bool Create(uint8_t* packet,
               size_t* index,
               size_t max_length,
               RtcpPacket::PacketReadyCallback* callback) const override;
 
  protected:
   std::vector<RtcpPacket*> appended_packets_;
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(CompoundPacket);
 };
 
 }  // namespace rtcp
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_COMPOUND_PACKET_H_