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This moves it out of the site isolation error section. This appears to
be a bug in the spec for intersection-observer when dealing with a
child local root, and not a bug in the implementation of site isolation
or the test (since it's testing a bad spec).

R=szager@chromium.org

Bug: 1007229
Change-Id: I639cb6ddb1d1a82df837fb0ba466922d29151943
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2222910
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774383}