Revert "Reland "Build CPU mipmaps with a series of draws""

This reverts commit ae5892bde50dd4e04ad38ed069c0fea8f243d9d0.

Reason for revert: G3 image diffs??

Original change's description:
> Reland "Build CPU mipmaps with a series of draws"
>
> This is a reland of commit 8784dd80e0cc355bfe6aa6b8fd7f087f190852bd
>
> Original change's description:
> > Build CPU mipmaps with a series of draws
> >
> > Much less code (~20k less), and supports all color types.
> >
> > This doesn't have the triangle-filter fix for odd sizes, so we will lose
> > a row/column of pixels at times. (Some GL implementations have this same
> > bug). One impact of building mips like this is that we could switch to
> > cubic filtering if we wanted -- that would fix the odd size issue, and
> > let us generate sharper mips.
> >
> > Performance is slightly worse for some common cases, but nowhere near as
> > bad as I feared. (And slightly better in a few cases, too).
> >
> > Bug: skia:13657
> > Change-Id: If1c9e98812cd32a99d07085b36bc3e0dbce556b3
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/596118
> > Commit-Queue: Brian Osman <brianosman@google.com>
> > Reviewed-by: Michael Ludwig <michaelludwig@google.com>
> > Reviewed-by: Brian Salomon <bsalomon@google.com>
>
> Bug: skia:13657
> Change-Id: Ie342c3435b6750e3141436e3aae2185bdbf483aa
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/596976
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Auto-Submit: Brian Osman <brianosman@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

Bug: skia:13657
Change-Id: I06d5940db6313bce40c5b9998c0ae746a612cb83
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/597479
Commit-Queue: Brian Osman <brianosman@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
3 files changed