Revert "Fix SW decompression of BC1 and add a GM to check it."

This reverts commit 4238751bc36957f193472f3b3f965b2a1caccfb8.

Reason for revert: This appears to be turning the PreAbandonGpuContext bot red

Original change's description:
> Fix SW decompression of BC1 and add a GM to check it.
> 
> Bug: skia:9680
> Change-Id: I8a8f9ee1aad783fc247c5516ac1effd0dab25936
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/268158
> Commit-Queue: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>

TBR=robertphillips@google.com,brianosman@google.com

Change-Id: I4304f13453579eb3ee6d3c0febe8c94ebfe915b2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:9680
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/268438
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
4 files changed