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This CL displays an error in chrome://extensions page when service
worker registrations fails, as opposed to calling DCHECK(false).

Bug: 1136582
Change-Id: Ie1619a922966d1b2e16ca316dc8f5dae8d448616
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505602
Commit-Queue: Ghazale Hosseinabadi <ghazale@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827016}