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I removed the ScreenProvider interface a while back, so naming the file
screen_provider doesn't make sense anymore.

BUG=none
test=none

Change-Id: Ie53dca7acd9aae61a1f196c240397c7fc78255bb
Reviewed-on: https://chromium-review.googlesource.com/1159264Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579974}