net: add histograms for OCSP and CRL fetch failures.
net: add histograms for OCSP and CRL fetch failures.

Without parsing, we can't detect OCSP responses that actually mean "I don't
know about this cert", or "This server has failed". But we can detect
timeouts, HTTP errors etc.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6880123

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@82640 0039d316-1c4b-4281-b951-d872f2087c98

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