Factor out some SSL specific configs, and add another reference to /var/run to
override as well.

TEST=not yet
BUG=none

Review URL: http://codereview.chromium.org/5591007

Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 3116ebe19e1ed9c9f71ce87124e029fec2768479