Close all writers before JingleSession is destroyed.

remoting/protocol/rtp_writer.cc

Index: remoting/protocol/rtp_writer.cc
diff --git a/remoting/protocol/rtp_writer.cc b/remoting/protocol/rtp_writer.cc
index e26bdb7c186534036436ae940c1345c81b9d55cb..fb1e1f8220105eea385ed5d965390b3b5da43bf9 100644
--- a/remoting/protocol/rtp_writer.cc
+++ b/remoting/protocol/rtp_writer.cc
@@ -29,6 +29,10 @@ void RtpWriter::Init(net::Socket* rtp_socket) {
   buffered_rtp_writer_->Init(rtp_socket, NULL);
 }
 
+void RtpWriter::Close() {
+  buffered_rtp_writer_->Close();
+}
+
 void RtpWriter::SendPacket(uint32 timestamp, bool marker,
                            const Vp8Descriptor& vp8_descriptor,
                            const CompoundBuffer& payload) {