Revert of Store mipmap levels in deferred texture image (patchset #11 id:200001 of https://codereview.chromium.org/2115023002/ )

Reason for revert:
speculative revert: android dm crashes

Original issue's description:
> Store mipmap levels in deferred texture image
>
> This is a follow-up to https://codereview.chromium.org/2034933003/ which
> was reverted due to a memory leak.
>
> When creating the deferred texture image, detect if using medium / high
> quality. If so, generate and store mipmaps in the deferred texture
> image.
>
> When creating a texture from that be sure to read it back out.
>
> BUG=578304
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2115023002
>
> Committed: https://skia.googlesource.com/skia/+/d6113140f7ae8996f679ac6698a60fb8c1386da3

TBR=brianosman@google.com,bsalomon@google.com,ericrk@chromium.org,cblume@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=578304

Review-Url: https://codereview.chromium.org/2227323002
6 files changed