This is part of the work to remove XUL overlays. The overlay was originally
created to help startup performance, but using a hidden panel instead seems to
have no detrimental effects to performance and is more straightforward.
MozReview-Commit-ID: JlWcZEhPXyH
This patch was autogenerated by my decomponents.py
It covers almost every file with the extension js, jsm, html, py,
xhtml, or xul.
It removes blank lines after removed lines, when the removed lines are
preceded by either blank lines or the start of a new block. The "start
of a new block" is defined fairly hackily: either the line starts with
//, ends with */, ends with {, <
