This cleans up after bug 984226, which introduced
CHILDREN_AND_PARENT_CHANGED to deal with the facts that:
(1) most properties whose changes yield UpdateOverflow style hints
imply that an element's overflow area may have changed, and
propagation to ancestors can stop without updating the element's
parent if the element's own overflow area didn't change.
(2) a few properties whose changes yield UpdateOverflow style hints
actually don't change the overflow area of the element on which the
property changed, but instead change that element's overflow area
on the element's parent.
Having two separate hints means that we don't have to do the extra work
of always updating the parent's overflow area (when the child's overflow
area didn't actually change) for the properties in category (1), and we
don't have to do extra work of updating the element's own overflow area
for properties in category (2).
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f6a6550205