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This allows to tell apart 2 different shared workers that have
the same url, name and constructor origin. This is possible when
the script url and/or the constructor origin have file: scheme.

Also removed the SharedWorkerInstance::Match() overload that takes
in a SharedWorkerInstance to make it clear we're not comparing 2
instances.

Bug: 1013168
Change-Id: I7a0efbfd71dae283ecfc97f3ae87df69a0fb5695
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850832Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707131}