Revert "Minor fixes to SkSL precisions"

This reverts commit 9752c3c3079140d7dbcf1fb2feb513f1e139a03a.

Reason for revert: prerequisite to reverting 05d5a13fea6246648de7e41358ed338d53c85ea2

Original change's description:
> Minor fixes to SkSL precisions
> 
> No-Presubmit: true
> No-Tree-Checks: true
> Bug: skia:
> Change-Id: Ife95d3ba457f79c00bf4fdd54af898a3a50402aa
> Reviewed-on: https://skia-review.googlesource.com/47241
> Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

TBR=bsalomon@google.com,ethannicholas@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: skia:
Change-Id: Ib1ef28bc94263154e54c01fd172d83ee48a797a8
Reviewed-on: https://skia-review.googlesource.com/47720
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
3 files changed