Revert "Exercise newly exposed SkYUVIndex-based SkImage factories"

This reverts commit e1c1d4d09c67a2c7ea897ea521c3f7d911c93880.

Reason for revert: Crashing on bots that abandon the GPU context

Original change's description:
> Exercise newly exposed SkYUVIndex-based SkImage factories
> 
> Bug: skia:7903
> Change-Id: I04630ebec37b087423e8305cc1716544fa00a403
> Reviewed-on: https://skia-review.googlesource.com/c/160020
> Reviewed-by: Jim Van Verth <jvanverth@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>

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

Change-Id: I5cd5eca3aa55feb73737643dbe05a374a6fd7842
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:7903
Reviewed-on: https://skia-review.googlesource.com/c/160026
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed