Add a unit test which checks that Negotiate is chosen over NTLM.
Add a unit test which checks that Negotiate is chosen over NTLM.

Negotiate is chosen over NTLM on Windows, but currently is not on
Linux or OSX since support has nat been added yet.

BUG=32824
TEST=Added new unit test and ran it.

Review URL: http://codereview.chromium.org/554043

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@36968 0039d316-1c4b-4281-b951-d872f2087c98

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