Fix for the chrome frame bug with POST requests to servers which request NTLM authentication. The bug was that the POST request would be issued to the server with no data. 
Fix for the chrome frame bug with POST requests to servers which request NTLM authentication.
The bug was that the POST request would be issued to the server with no data. 

Reason: The cbstgmedData member in the BINDINFO structure passed into our
        IBindStatusCallback::GetBindInfo implementation needs to be initialized to the post 
        data length. Not setting this causes urlmon to treat this as a chunked upload thus
        causing it to not set the Content-Length header in the outgoing POST request.
        Many thanks to Igor Tandetnik for pointing this out.

Removed the code to set the Content-Length header in our BeginningTransaction implementation
as this is no longer needed.

Fixes bug http://code.google.com/p/chromium/issues/detail?id=62687

BUG=62687
TEST=manually at this point with an IIS web server configured for NTLM authentication.

Review URL: http://codereview.chromium.org/6651003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@77348 0039d316-1c4b-4281-b951-d872f2087c98

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