Bug 1646516 Comment 6 Edit History

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Most of the callers are related to fullscreen, which has been checked in bug 1646491.
Others are,
1. https://searchfox.org/mozilla-central/rev/54097530955a98c768f2aaf56925578ec886ec77/dom/base/DOMIntersectionObserver.cpp#452,460
2. https://searchfox.org/mozilla-central/rev/54097530955a98c768f2aaf56925578ec886ec77/layout/base/GeometryUtils.cpp#330
3. https://searchfox.org/mozilla-central/rev/54097530955a98c768f2aaf56925578ec886ec77/layout/base/PresShell.cpp#8415

1) and 2) looks fine since they do expect nsContentUtils::GetRootDocument doesn't cross the process boundary.  
I am checking 3) and will file a separated bug if needed.
Most of the callers are related to fullscreen, which has been checked in bug 1646491.
Others are,
1. https://searchfox.org/mozilla-central/rev/54097530955a98c768f2aaf56925578ec886ec77/dom/base/DOMIntersectionObserver.cpp#452,460
2. https://searchfox.org/mozilla-central/rev/54097530955a98c768f2aaf56925578ec886ec77/layout/base/GeometryUtils.cpp#330
3. https://searchfox.org/mozilla-central/rev/54097530955a98c768f2aaf56925578ec886ec77/layout/base/PresShell.cpp#8415

1) and 2) looks fine since they do expect nsContentUtils::GetRootDocument doesn't cross the process boundary.  

I am checking 3) and will file a separated bug if needed.

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