Close all writers before JingleSession is destroyed.

remoting/protocol/rtp_video_writer.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_PROTOCOL_RTP_VIDEO_WRITER_H_
 #define REMOTING_PROTOCOL_RTP_VIDEO_WRITER_H_
 
 #include "remoting/protocol/rtp_writer.h"
 #include "remoting/protocol/video_writer.h"
 
 namespace remoting {
 namespace protocol {
 
 class Session;
 
 class RtpVideoWriter : public VideoWriter {
  public:
   RtpVideoWriter();
   virtual ~RtpVideoWriter();
 
   // VideoWriter interface.
-  virtual void Init(protocol::Session* session);
+  virtual void Init(protocol::Session* session) OVERRIDE;
+  virtual void Close() OVERRIDE;
 
   // VideoStub interface.
-  virtual void ProcessVideoPacket(const VideoPacket* packet, Task* done);
-  virtual int GetPendingPackets();
+  virtual void ProcessVideoPacket(const VideoPacket* packet,
+                                  Task* done) OVERRIDE;
+  virtual int GetPendingPackets() OVERRIDE;
 
  private:
   RtpWriter rtp_writer_;
 
   DISALLOW_COPY_AND_ASSIGN(RtpVideoWriter);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_RTP_VIDEO_WRITER_H_