HTTP based FT fails if there's a pending chat session

[GoogleCodeExporter]

What steps will reproduce the problem?
1. start an HTTP based file transfer
2. BEFORE upload is ready send a chat message to the very same B party
3. BEFORE chat session triggered in 2 is ACKed the upload is finished

What is the expected output? What do you see instead?
OriginatingHttpFileSharingSession.sendResultToContact() should queue the upload 
of XML file description to B. Instead it tries to use an MSRP session by the 
call of chatSession.sendDataChunks which is not yet in place.

Original issue reported on code.google.com by andreas-...@telekom.de on 20 Mar 2014 at 3:47