Add CancelChannelCreation() in protocol::Session interface.

remoting/protocol/protobuf_video_reader.cc

 // Copyright (c) 2011 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.
 
 #include "remoting/protocol/protobuf_video_reader.h"
 
 #include "base/bind.h"
 #include "base/task.h"
 #include "net/socket/stream_socket.h"
 #include "remoting/base/constants.h"
 #include "remoting/proto/video.pb.h"
 #include "remoting/protocol/session.h"
 
 namespace remoting {
 namespace protocol {
 
 ProtobufVideoReader::ProtobufVideoReader(VideoPacketFormat::Encoding encoding)
-    : encoding_(encoding),
+    : session_(NULL),
+      encoding_(encoding),
       video_stub_(NULL) {
 }
 
-ProtobufVideoReader::~ProtobufVideoReader() { }
+ProtobufVideoReader::~ProtobufVideoReader() {
+  if (session_)
+    session_->CancelChannelCreation(kVideoChannelName);
+}
 
 void ProtobufVideoReader::Init(protocol::Session* session,
                                VideoStub* video_stub,
                                const InitializedCallback& callback) {
+  session_ = session;
   initialized_callback_ = callback;
   video_stub_ = video_stub;
 
-  session->CreateStreamChannel(
+  session_->CreateStreamChannel(
       kVideoChannelName,
       base::Bind(&ProtobufVideoReader::OnChannelReady, base::Unretained(this)));
 }
 
 void ProtobufVideoReader::OnChannelReady(net::StreamSocket* socket) {
   if (!socket) {
     initialized_callback_.Run(false);
     return;
   }
 
   DCHECK(!channel_.get());
   channel_.reset(socket);
   reader_.Init(socket, base::Bind(&ProtobufVideoReader::OnNewData,
                                   base::Unretained(this)));
   initialized_callback_.Run(true);
 }
 
 void ProtobufVideoReader::OnNewData(VideoPacket* packet,
                                     const base::Closure& done_task) {
   video_stub_->ProcessVideoPacket(packet, done_task);
 }
 
 }  // namespace protocol
 }  // namespace remoting