A few places were passing a reference to a reference, which just gets
compiled out anyways.
Some other places where passing `|e| ErrorName(e)` as a closure when
just `ErrorName` would be more succinct.
Change-Id: Ic097a81b956ef82b29fc1a15196c245bee61c251
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/510782
Reviewed-by: Zach Reizner <zachr@chromium.org>