Add a unit test to verify that an invalid status code (-1) won't cause the HttpResponseHeaders constructor to crash.
Add a unit test to verify that an invalid status code (-1)
won't cause the HttpResponseHeaders constructor to crash.

R=eroman@chromium.org
BUG=none
TEST=net_unittests --gtest_filter=
HttpResponseHeadersTest.NormalizeHeadersInvalidStatusCode

Review URL: http://codereview.chromium.org/7107001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@87545 0039d316-1c4b-4281-b951-d872f2087c98

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