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This makes the pres shell be notified as the last observer unconditionally. In practice this doesn't matter, and it may already be the case if an iframe goes display: none and back. In practice, the only dependency that requires this order is that the pres shell needs to be notified _after_ the content sink, so we don't try to enter frame construction before beginning the shell update. That may be worth looking into, but definitely not in the scope of this bug... :) MozReview-Commit-ID: 9WeJ5kaUtBq --HG-- extra : rebase_source : 6589df0aa8a875dc270894fabb6b4bc170d6b6fe