Revert "Add 2x2 bilinear downscale steps to GrSurfaceContext::rescale."

This reverts commit 9c6f6bf031b4bc0c40358eca2de43911fe13bbfb.

Reason for revert: likely hurt flutter perf
https://github.com/flutter/flutter/issues/58716

Original change's description:
> Add 2x2 bilinear downscale steps to GrSurfaceContext::rescale.
>
> Currently just uses 2x2 configuration but could be adapted easily
> to support other sample position layouts.
>
> Change-Id: If857bac5d1fab1b6ee04694e445d0f19431646f1
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/292079
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Michael Ludwig <michaelludwig@google.com>

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

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I8c322c02e22622ab61b99e4a8c241b30a2a31b12
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/294399
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2 files changed