Reduce the network timeout for NSS from 60 seconds to 15 seconds
Reduce the network timeout for NSS from 60 seconds to 15 seconds

BUG=143747
TEST=On Linux, Enable revocation checking via preferences.
  Run chrome with --v=1 from behind a captive portal/firewall that
  allows SSL access to a particular host, but does not allow OCSP
  or CRL fetches, and instead blackholes them (holds the TCP
  connection open). You should see "OCSP Timed out" after 15
  seconds from when the OCSP connection started.

Review URL: https://chromiumcodereview.appspot.com/10875059

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@154105 0039d316-1c4b-4281-b951-d872f2087c98

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