Revert "Allow direct readback for formats in non-ES OpenGL"

This reverts commit 162d16891fa07768d9fb9fbcd357a06878284907.

Reason for revert: red on bots

Original change's description:
> Allow direct readback for formats in non-ES OpenGL
> 
> Bug: skia:8962
> Change-Id: I85a2e228892a54cc2a0abd607d034515a9af12af
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/250258
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>

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

Change-Id: I9509665678e3f4984143ff4f2d91565c4339a006
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:8962
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/250656
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
4 files changed