Deprecate power, resume, and screen lock functions BUG=chromium-os:21115,chromium-os:16558,chromium-os:16559 TEST=emerge libcros Change-Id: I2239006c201f4e0c2d2f21eee65e937917746d40 Signed-off-by: Simon Que <sque@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/12356 Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>