Revert "Perform bounding rect-relative calcs in full float in GrRRectBlurEffect"

This reverts commit f4594d1d5bd3eb7c82a6634a165039acba1386df.

Reason for revert: skp gone bad

Original change's description:
> Perform bounding rect-relative calcs in full float in GrRRectBlurEffect
>
> Add GM that tests very wide/tall SkRRects with blurs
>
> Bug: chromium:1138810
> Change-Id: Ib5a2e04de50c441f57f5e4b6194c3f9829323dc9
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/328383
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Michael Ludwig <michaelludwig@google.com>

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

Change-Id: I3633efd4802a0a9493831ec471304333272fa87e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1138810
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/328905
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
3 files changed