Split ConfigurationPolicyHandlerList building into a separate builder.

More policy componentization...

BUG=271392

Review URL: https://codereview.chromium.org/108333002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239273 0039d316-1c4b-4281-b951-d872f2087c98
Eliminate input ack-to-string log warnings

Add string conversion for INPUT_EVENT_ACK_STATE_IGNORED, eliminating an
unhandled ack log warning and forcing a compile error for states added in the
future.

NOTRY=true

Review URL: https://codereview.chromium.org/108663002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239274 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239274