Remove bulk GrDrawingManager::appendTasks

This was removed in 334422 but got put back due to code
in that area dancing around and merging.

Change-Id: Ic9f51f8de92d3aa763ac6e3a8dc34397230260df
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/335578
Auto-Submit: Adlai Holler <adlai@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Adlai Holler <adlai@google.com>
2 files changed