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With this change, only downloads that match a whitelisted URL or certificate will be exempt from the download protection pingback.  The certificate whitelist format allows matching on the certificate issuer along with the CN, O, or OU attributes of the certificate.

BUG=102540
TEST=DownloadProtectionServiceTest


Review URL: http://codereview.chromium.org/8762007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112604 0039d316-1c4b-4281-b951-d872f2087c98