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This CL abstracts the actual lock window allowing for a GTK implementation and an aura implementation. The aura screenlocker stubs are removed and the screenlocker is enabled on aura using the aura lock window.

BUG=100723
TEST=Build chrome with use_aura=1, trigger screen lock and test unlocking screen.


Review URL: http://codereview.chromium.org/8711003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112709 0039d316-1c4b-4281-b951-d872f2087c98