Here is another usage of GetInProcessRootTreeItem in fullscreen code. https://searchfox.org/mozilla-central/rev/03794edd6edcc3fc1e222de966cb27256ce08998/dom/base/Document.cpp#13765,13854 I will also try to also it in this bug.
Bug 1585074 Comment 5 Edit History
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Here is another usage of GetInProcessRootTreeItem in fullscreen code. https://searchfox.org/mozilla-central/rev/03794edd6edcc3fc1e222de966cb27256ce08998/dom/base/Document.cpp#13765,13854 I will also try to rewrite it in this bug.