Revert of Add fast normalize for SkLightingImageFilter. (patchset #2 id:20001 of...

Revert of Add fast normalize for SkLightingImageFilter. (patchset #2 id:20001 of https://codereview.chromium.org/1240023002/)

Reason for revert:
Speculative revert -- DEPS roll block on linux_blink_rel

https://storage.googleapis.com/chromium-layout-test-archives/linux_blink_rel/71483/layout-test-results/results.html

Original issue's description:
> Add fast normalize for SkLightingImageFilter.
>
> The normalize routine in SkPoint3 is very robust. However, for simple
> lighting cases we prefer speed over robustness. This fixes a perf
> regression in smoothness.tough_filters_cases.
>
> BUG=chromium:510562
>
> Committed: https://skia.googlesource.com/skia/+/dfa0ecf169db87f7afddd93bc1c500de481a62c7

TBR=reed@google.com,senorblanco@google.com,senorblanco@chromium.org,jvanverth@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:510562

Review URL: https://codereview.chromium.org/1244523002