Close all writers before JingleSession is destroyed.

remoting/protocol/client_control_sender.h

Index: remoting/protocol/client_control_sender.h
diff --git a/remoting/protocol/client_control_sender.h b/remoting/protocol/client_control_sender.h
index 08b8f82e5e8a12c559164ae3ee144c42a693119a..763ae9a0204093eb93fb9474553b41bd3126da72 100644
--- a/remoting/protocol/client_control_sender.h
+++ b/remoting/protocol/client_control_sender.h
@@ -27,9 +27,11 @@ namespace protocol {
 
 class BufferedSocketWriter;
 
+// Implementation of ClientStub that sends commands on a socket. Must
+// be created and closed on the network thread, but can be used on any
+// other thread.
 class ClientControlSender : public ClientStub {
  public:
-  // Create a stub using a socket.
   explicit ClientControlSender(net::Socket* socket);
   virtual ~ClientControlSender();
 
@@ -38,6 +40,10 @@ class ClientControlSender : public ClientStub {
   virtual void BeginSessionResponse(const LocalLoginStatus* msg,
                                     Task* done);
 
+  // Stop writing. Must be called on the network thread when the
+  // underlying socket is being destroyed.
+  void Close();
+
  private:
   // Buffered socket writer holds the serialized message and send it on the
   // right thread.