Don't clear StyleAffectedByEmpty before recalc.

Don't clear StyleAffectedByEmpty before recalc.

ElementRareData::resetStyleState() cleared the StyleAffectedByEmpty flag
before recalculating style for an Element. However, this flag can be set by
style recalc for any of the sibling subtree elements in the presence of
adjacent combinators. If you have a LocalStyleChange for the element that
may become empty/non-empty, the flag can not be cleared since it may never
be set again unless the siblings affected by the :empty state are
recalculated.

R=esprehn@chromium.org
BUG=412950
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181799

[esprehn, 2014-09-11 00:56:10]

Hmm, this means that nothing will ever clear this flag so once you're affected
by empty we'll think you are forever. I guess that's okay since this is such an
obscure feature.

lgtm

[rune, 2014-09-11 06:25:40]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2014-09-11 06:25:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/558333002/1

[commit-bot: I haz the power, 2014-09-11 07:30:19]

Committed patchset #1 (id:1) as 181799