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Previously, the x509 cert implementation only had SHA-1 based fingerprinting for
quickly creating indexing appropriate hashes. Since SHA-1 is likely
cryptographically broken, these fingerprints should not be used for any security
decisions. This adds slow SHA-256 fingerprint support for when fingerprints are
needed for security decisions.

R=rsleevi@chromium.org
BUG=262615

Review URL: https://codereview.chromium.org/412263003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285851 0039d316-1c4b-4281-b951-d872f2087c98