The platform RSAPrivateKey is used to generate the private key, which is then imported into NSS to generate the certificate.
X509Certificate::CreateOriginBound is moved to x509_util::CreateOriginBoundCert so it can be shared by those platforms, and removes the unnecessary X509Certificate generation step.
BUG=88782
TEST=X509UtilNSSTest.CreateOriginBoundCert & manual testing: try on win or mac, check if generated cert has the OBC extension.
Review URL: http://codereview.chromium.org/8296014
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@105997 0039d316-1c4b-4281-b951-d872f2087c98