Enable policy-pushed ONC networks.
Enable policy-pushed ONC networks.

BUG=chromium-os:19411
TEST=Push network policy to the device and observe that Chrome accepts and imports it.

Change-Id: I8d46b40b096f90e629aeeff3d6708c06bf4e02a4
Reviewed-on: https://gerrit.chromium.org/gerrit/12977
Commit-Ready: Mattias Nissler <f2124f8e21694335a48d099eb9510c5c4dda0d0b@chromium.org>
Reviewed-by: Mattias Nissler <f2124f8e21694335a48d099eb9510c5c4dda0d0b@chromium.org>
Tested-by: Mattias Nissler <f2124f8e21694335a48d099eb9510c5c4dda0d0b@chromium.org>

chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager