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If a worker stops right after it sends an extension event ack,
decrementing ref count (FinishExternalRequest) can fail in the
browser process. This happens if the browser process has already dropped
knowledge about the worker.

Ignore FinishExternalRequest's result in this case, after examining
the worker's status in ProcessManager. This reduces flaky failures
of ServiceWorkerTest.Update(Un)PackedExtension tests.

Bug: 999027
Change-Id: Iad0287067eff0feab7cf64ff21768c204009969c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832491
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: David Bertoni <dbertoni@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706082}