We can get rid of this parameter now that we call notify
directly on the display in cases where we need to.

BUG=angle:795

Change-Id: I2024b70d0d725e755f7aa742ba221c2d0179d8b6
Reviewed-on: https://chromium-review.googlesource.com/228911Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>