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Issue 839117 prevents the Exposed attribute from working properly on
partial interfaces. There are therefore a handful of attributes which
manually check the type of worker they are being requested in and return
null rather than being undefined.

This change adds tests for this behavior in shared workers.

Bug: 839117
Change-Id: If79929622e8f98a01e059dc90ff1514131035487
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538501
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Yoav Weiss <yoavweiss@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830663}