Revert my recent change to WritePixelsNonTexture_Gpu.

This check isn't correct, since most backends will use a fallback path if
writePixels directly to a surface fails.

That fallback path doesn't work for Dawn currently, so skip the test
on the Dawn backend.

Change-Id: I07f9a25640bc579d6b0952e208237368d007b06d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/294702
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>
1 file changed