Remove confusing keyboard test & inspect input device

In order to make the decision for when to trigger the OOBE display
chooser less confusing for end users I'm removing the keyboard check.
Instead an explicit remora requisition check is used to limit the
effects.

BUG=738885

Review-Url: https://codereview.chromium.org/2964823002
Cr-Commit-Position: refs/heads/master@{#485019}
3 files changed