Fix bogus DCHECK and rename DidForkFromZygote.

The method can also be called for non-zygote forked processes.

(cherry picked from commit 9d157e48e0abc48f08fd98e4c5e918d029c1b84c)

Change-Id: Id4f57b77c1a7f802f80e066afcf30afecc198bfc
3 files changed