remove SkError

It has not caught on.

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3321

Change-Id: Ib2ee4ef99bc89c8f4b7504e42a9d7d9dfc483015
Reviewed-on: https://skia-review.googlesource.com/3321
Reviewed-by: Leon Scroggins <scroggo@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
18 files changed