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This handler tracks Shill's profiles.
Currently only the ManagedNetworkConfigurationHandler is making use of this
handler but it is also required for upcoming changes to proxy handling in ChromeOS.

In the ONC validator only an LOG(ERROR) was fixed to LOG(WARNING) if the flag error_on_missing_field=false.

BUG=157696
TEST=managed_network_configuration_handler_unittest.cc, networking_private_apitest.cc

Review URL: https://chromiumcodereview.appspot.com/13957012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@198798 0039d316-1c4b-4281-b951-d872f2087c98