Bug 1681643 [wpt PR 26831] - [IntersectionObserver] Don't allow cross-document explic...

Bug 1681643 [wpt PR 26831] - [IntersectionObserver] Don't allow cross-document explicit root, a=testonly

Automatic update from web-platform-tests
[IntersectionObserver] Don't allow cross-document explicit root

This fixes an bug with the recently-added feature to allow an
observer's explicit root to be a document. In such cases, if a target
element is not in the root document, it should be reported as
"not intersecting".

Change-Id: Iea6bc2444fc5b2bf2dca50cf242d46324a502dbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583217
Commit-Queue: Stefan Zager <szager@chromium.org>
Auto-Submit: Stefan Zager <szager@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835786}

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wpt-commits: 7ac57afffe913350ea699c0614c362d86eb3e50e
wpt-pr: 26831