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issued by a VeriSign intermediate CA.

Change the CertVerifier cache to identify a certificate chain by the
hash of the entire chain rather than just the server certificate.

This requires adding X509Certificate::chain_fingerprint(), and the
X509Certificate::CalculateChainFingerprint() method to compute the
chain fingerprint.

R=agl@chromium.org,rsleevi@chromium.org
BUG=101555
TEST=X509CertificateTest.ChainFingerprints and
CertVerifierTest.DifferentCACerts in net_unittests

Review URL: http://codereview.chromium.org/8400075

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107888 0039d316-1c4b-4281-b951-d872f2087c98