hbos e29352bb34 Refactor certificate stats collection, added SSLCertificateStats.
The code that extracts certificate stats from an SSLCertificate and its
certificate chain is moved into SSLCertificate::GetStats. The stats
collector code loops through the resulting SSLCertificateStats and
creates the StatsReports for those stats.

This will allow the new stats collector to reuse GetStats in a future
CL.

BUG=chromium:627816, chromium:629436

Review-Url: https://codereview.webrtc.org/2259283002
Cr-Commit-Position: refs/heads/master@{#13917}
2016-08-25 10:52:46 +00:00
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