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Currently only Worker (DedicatedWorker) works on SWA but not
SharedWorker since it will hit unknown scheme error due to its scheme
(chrome://).

The reason is that currently we don't put an WebUIUrlLoaderFactory when
creating factory bundle in WorkerScriptFetchInitiator so it will try to
fetch scripts with "chrome://" scheme through internet, and causes the
unknown scheme error.

Bug: 980846, 1127464
Test: Chrome camera app (SWA version) can use SharedWorker
Change-Id: Ia57a18d75963fb3395a37d2ed3c70d21e7964282
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2406234
Commit-Queue: Wei Lee <wtlee@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810487}