Revert 69356 - Regenerate the root certificate and end-entity certificates used for various tests in net_unittests, now that Windows can temporarily trust certificates for the duration of tests.

In addition, add unittests for net::TestRootCerts, which depend on the certs being tested not being trusted by the system beforehand.

BUG=8470, 5552
TEST=TestRootCertsTest.*

Review URL: http://codereview.chromium.org/5535006

TBR=rsleevi@chromium.org

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@69363 0039d316-1c4b-4281-b951-d872f2087c98