Remove FCLocker::Suspend.

It's a bad idea, difficult to reason about, and may be causing
deadlocks.

Change-Id: Id9749661f4f3f942ee983e9c1fdab2bd7f287edb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/335242
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2 files changed