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The caller-side in extensions may want to take different actions
depending on how things failed. Per discussion at:
https://chromium-review.googlesource.com/c/chromium/src/+/1763560

There is no behavioral change yet except that the Stop* function no
longer fails if the worker is STOPPING. There's no reason to fail there,
we can just finish the request as requested.

Bug: 999027, 824858
Change-Id: Ib04cd671e99af6afd082562d13c9677772894c26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1792518
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695382}