Revert "Inset blur domain a tiny bit to prevent certain GPUs from sampling transparent black from scratch textures."
Revert "Inset blur domain a tiny bit to prevent certain GPUs from sampling transparent black from scratch textures."

This reverts commit 730c53ae3c81736dc1877a5d520700a767ea2f7a.

Reason for revert: Requires Layout Test suppressions.

Original change's description:
> Inset blur domain a tiny bit to prevent certain GPUs from sampling transparent black from scratch textures.
> 
> When running Skia GPU blur on an iPhone X, I noticed a bit a of transparency seeping into my clamped blur on the right and/or bottom edges of certain-sized rectangular blurs with large blur radii.
> 
> I could only repro this on an iPhone X; I couldn't repro on a retina Macbook Pro or a 1x external screen.
> 
> I think the iPhone X GPU is rounding the sampling coordinate a little differently than most other GPUs or there's some floating point error involved in the shader that makes it sample pixels outside of the desired blur domain. Since the blur source is inside a scratch texture filled with transparent black, some undesirable transparent black gets pulled in when we're decimating and blurring the source.
> 
> Bug: https://bugs.chromium.org/p/skia/issues/detail?id=8942
> 
> Change-Id: Iff28c3ee5d069c6999a831d4b156a650be3a9eb8
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205208
> Reviewed-by: Brian Salomon <61fabaaf0876044aeedfd8e351e485c028d69e7b@google.com>
> Commit-Queue: Brian Salomon <61fabaaf0876044aeedfd8e351e485c028d69e7b@google.com>

TBR=61fabaaf0876044aeedfd8e351e485c028d69e7b@google.com,mvujovic@adobe.com

Change-Id: I3b35965183e47b69167bb8763c433685c30e286a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: https://bugs.chromium.org/p/skia/issues/detail?id=8942
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205585
Reviewed-by: Brian Salomon <61fabaaf0876044aeedfd8e351e485c028d69e7b@google.com>
Commit-Queue: Brian Salomon <61fabaaf0876044aeedfd8e351e485c028d69e7b@google.com>

google/skia,rubenvb/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,HalCanary/skia-hc,google/skia,google/skia,HalCanary/skia-hc,rubenvb/skia,rubenvb/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,rubenvb/skia,rubenvb/skia,rubenvb/skia,aosp-mirror/platform_external_skia,rubenvb/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,rubenvb/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,HalCanary/skia-hc,rubenvb/skia,google/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,rubenvb/skia