style: Make NotNull move its member pointer where possible.
style: Make NotNull move its member pointer where possible.

Differential Revision: https://phabricator.services.mozilla.com/D72827

KiChjang/servo,splav/servo,splav/servo,splav/servo,splav/servo,KiChjang/servo,KiChjang/servo,KiChjang/servo,KiChjang/servo,KiChjang/servo,splav/servo,splav/servo,KiChjang/servo,splav/servo,KiChjang/servo,KiChjang/servo,KiChjang/servo,splav/servo,splav/servo,splav/servo