Improve unit test coverage of HttpAuthHandlerDigest parsing.

Also, if the only qop is auth-int, use a different handler since this is not currently handled.

BUG=45194
TEST=net_unittests --gtest_filter="*HttpAuthHandlerDigest*"

Review URL: http://codereview.chromium.org/4825001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@66137 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed