Remove ARC from tools lib.

Trying this in baby steps to manage leaks better.

Change-Id: Id8597ba236c752bcbf1c7ec94f6c1021e636d547
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/372556
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Adlai Holler <adlai@google.com>
13 files changed