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This fixes failures in
http/tests/serviceworker/chromium/register-error-messages.html

Bug: 715640
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: Id089672074157d5e861d7539ee08115cf7b55488
Reviewed-on: https://chromium-review.googlesource.com/1004555
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550102}