Revert of Thorough tests for saturatedAdd and mulDiv255Round. (patchset #1 id:1 of https://codereview.chromium.org/1184113003/)

Reason for revert:
https://code.google.com/p/skia/issues/detail?id=3951

Original issue's description:
> Thorough tests for saturatedAdd and mulDiv255Round.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/ce9d11189a5924b47c3629063b72bae9d466c2c7

TBR=fmalita@chromium.org,mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1177123004
1 file changed