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To handle lucid sleep (where we need to silently resume the system), turn
off the displays on suspend. This also removes the delay for restoring the
display state added in "On resume perform a delayed call to
SetDisplayPower()" According to the bug for that change, it didn't seem to
help with the issue anyways.

BUG=535021
TEST=suspend/resume of various cros platforms with/without external monitor
connected

Review URL: https://codereview.chromium.org/1861593002

Cr-Commit-Position: refs/heads/master@{#389875}