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It's a bit hardcoded (port 443, NPN/SPDY2), but it is just for
testing purposes.

To use this mode, run chrome with:
   chrome.exe --use-spdy=npn,force-alt-protocols

BUG=none
TEST=http_alternate_protocols_unittest.cc

Review URL: http://codereview.chromium.org/3195015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@57022 0039d316-1c4b-4281-b951-d872f2087c98