Revert "SkRegion: more robust validation"

This reverts commit 711450e948b9900011dc0d474f82bf7bc9913259.

Reason for revert: speculative revert to fix chrome roll.

Original change's description:
> SkRegion: more robust validation
> 
> BUG=oss-fuzz:1864
> Change-Id: I4c3d3c4c7b0717399fe16f227e032682b13ebc74
> Reviewed-on: https://skia-review.googlesource.com/20322
> Reviewed-by: Cary Clark <caryclark@google.com>
> Commit-Queue: Hal Canary <halcanary@google.com>

TBR=halcanary@google.com,caryclark@google.com,reed@google.com

Change-Id: I95cbbf064db6ea7ef74a757bca058ba8de20d87b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: oss-fuzz:1864
Reviewed-on: https://skia-review.googlesource.com/20452
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
2 files changed