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When an extension is deactivated, SWTQ unregisters the extension's
worker. Subsequently, if the extension was re-activated quickly (which
is the typical e.g. from ExtensionApiTest::RunExtensionTest due to
kFlagEnableFileAccess), then it is expected that the unregistration
can fail (as the initial extension activation couldn't complete SW
registration). This CL doesn't log unregistration failure error
message in that case, removing confusion around the log.

Bug: None
Test: No behavior changes, spurious unregistration failed error shouldn't be seen from service_worker_apitest.
Change-Id: Ifccbc649b492f9cbe8527a5e6412cca2aea2d5ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2266016Reviewed-by: David Bertoni <dbertoni@chromium.org>
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782747}