Delete unused GrTextureOpList.

In a follow up CL I will be merging GrRenderTargetOpList and GrOpList
since we no longer have need for that separation.

Change-Id: I267ead3beeceaece504968ca69165c425d38f761
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/236337
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
14 files changed