This patch basically does:
* remove StyleSetHandle and its corresponding files
* revisit #includes of related header files and change correspondingly
* change nsIPresShell::mStyleSet to be UniquePtr<ServoStyleSet>
* change the creating path of ServoStyleSet to pass UniquePtr
* change other mentions of StyleSetHandle to ServoStyleSet*
* remove AsServo() calls on ServoStyleSet
Some unfortunate bits:
* some methods of (Servo)StyleSet only accepts ServoStyleSheet while
many places call into the methods with StyleSheet, so there are many
->AsServo() added to sheets
MozReview-Commit-ID: K4zYnuhOurA
nsStyleStructList.h was initially made generated in bug 873368 to avoid
manually maintaining boilerplate for if-dispatch, while the if-dispatch
was replaced by jump table in bug 1171842, so the boilerplate went away.
However, in bug 1122781 (before bug 1171842), boilerplate for dependency
check, so it still needs to be generated.
The dependency table is removed in the previous patch, so we no longer
have any boilerplate in the style struct list, and thus it doesn't need
to be generated anymore.
MozReview-Commit-ID: GkbJZ98ojbE
The aSamePointerStructs argument is unused now.
Also, aIgnoreVariables can be true everywhere now, since variable changes can't
generate change hints, and anonymous boxes and such don't care about whether
they really changed or not.
Only one caller cares about struct equality, and that already compares variables
manually as an optimization on the rust side.
We had this optimization inconsistently in some cases but not others.
MozReview-Commit-ID: F2EISKlxR3K
