Update cros_system_api revision.

BUG=304979
TEST=Manually, by changing .DEPS.git
R=benchan@chromium.org

Review URL: https://codereview.chromium.org/27633002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229261 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229261