Revert of Retract GrRenderTarget from AlphaClipMask code (patchset #3 id:40001 of https://codereview.chromium.org/1977793004/ )

Reason for revert:
Possible cause of leak in ASAN bot:

https://uberchromegw.corp.google.com/i/client.skia/builders/Test-Ubuntu-GCC-Golo-GPU-GT610-x86_64-Debug-ASAN/builds/3351

Original issue's description:
> Retract GrRenderTarget from AlphaClipMask code
>
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1977793004
>
> Committed: https://skia.googlesource.com/skia/+/93bc24e8b09b5ad7498ce9bc9a6519c7a43dbc9d

TBR=robertphillips@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/1975353002
2 files changed