The autofocus attribute on form elements forces layout in CheckIfFocusable.
To avoid unpleasant FOUCs, defer autofocus processing until frames are
constructed in PresShell::Initialize.
Resolve the race between nsAutoFocusEvent running and page load by checking the
readystate at time of event posting. Skip autofocus if the element moved to a
different window in the meantime.
MozReview-Commit-ID: 90jiJYJWmRg
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extra : rebase_source : f94b479075df3e37ec1a658d71596c03930bab92
dd080e9eba