Revert 67530 - Persist 'this device is not managed' information

This is necessary backend work for fixing bug 64314 (make login wait only for the first registration check).
It also enables subsequent polling of the DM server at defined intervals (rather than at each login, or never).

BUG=64314
TEST=unit tests: DeviceManagementPolicyProviderTest.*

Review URL: http://codereview.chromium.org/5331008

TBR=jkummerow@chromium.org
Review URL: http://codereview.chromium.org/5321011

git-svn-id: http://src.chromium.org/svn/trunk/src/chrome/browser/policy/proto@67531 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed