[Chrome OS] Fix storing of proxy information on Chrome OS
DCHECK()s are not compiled in non-Debug builds. Any statement inside a DCHECK() will therefore not occur
on Release builds :-)
When persisting proxy information via the SignedSettings API, the call that stuffed the proxy info
into the policy we ultimately send out over DBus was wrapped in a DCHECK()
BUG=chromium-os:14326
TEST=manual, unit_tests
R=mnissler@chromium.org
Review URL: http://codereview.chromium.org/
6880102
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@82469 0039d316-1c4b-4281-b951-d872f2087c98