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Changes in the preferences should be reflected immediately. This CL adds tests
on dedicated workers, shared workers, and service workers.

Bug: 853085
Change-Id: I8ea97eb45a02ecc81912c93a72127d4931148aa8
Reviewed-on: https://chromium-review.googlesource.com/1167062Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581822}