Yank out old reduceOpsTaskSplitting code

The behavior previously triggered by this flag is reimplemented
in review.skia.org/345168 . The current implementation isn't used
and can't really be used safely because it may go over the
GPU memory budget.

Bug: skia:10877
Change-Id: I2759c688aa60a618ef76dfec0a49ef5e5f0a9afc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/345477
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Auto-Submit: Adlai Holler <adlai@google.com>
3 files changed