Revert "Initiate regeneration of mipmaps from proxy DAG land"

This reverts commit fe19203eb7d7e8bef528287494d82c2eb4efff0e.

Reason for revert: Turned a lot of bots red

Original change's description:
> Initiate regeneration of mipmaps from proxy DAG land
> 
> This allows us to resolve all the textures before executing a command
> buffer, rather than interrupting execution as is currently done in the
> GL backend.
> 
> Change-Id: I998546b312d24cf47fc2c837e7c94fbf95571af0
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/230636
> Commit-Queue: Chris Dalton <csmartdalton@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>

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

Change-Id: Iaa8391b8fbd5a4f851ca41834c1dfeee4be6fedd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/233836
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
15 files changed