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Several tests are crashing because FilterInterfacesImpl() is called when
starting a dedicated worker in a process that was never initialized or
is dead, and process->GetChildIdentity() has a DCHECK against that.
There is already an early return for a null process, so also check if
it's alive.

Bug: 1010866
Change-Id: I397e493456f1d61abfe3e247d7bc7d4c29cc6954
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868769Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707355}