Revert "Add GrContext api to update compressed backend textures."

This reverts commit 2c180304dc239a44770df7bf2649f3138f25922c.

Reason for revert: attempted workaround did not fix techno spark so needs further investigation

Original change's description:
> Add GrContext api to update compressed backend textures.
> 
> Bug: chromium:1099255
> Change-Id: I0c3f25ddb037e47e3b910fa89c3d8b3aa27b3114
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/302265
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Commit-Queue: Greg Daniel <egdaniel@google.com>

TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com

Change-Id: Ib5433def02dc5dad97dcdbd4476ced6de2361e6a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1099255
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/302576
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
4 files changed