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This updates PowerPolicyController to always send the power
management policy contained in Chrome's preferences to the
power manager, rather than only sending prefs that have been
changed from their defaults.  Note that this currently only
takes effect once the user has logged in.

It also makes the screen get locked at the same time as when
it's turned off when the "Require password to wake from
sleep" setting is enabled.

BUG=225730,225969

Review URL: https://codereview.chromium.org/14134004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195376 0039d316-1c4b-4281-b951-d872f2087c98