Remove hasResolver() check from Document::updateStyle.
Remove hasResolver() check from Document::updateStyle.

The resolver cannot disappear in the middle of a style recalc, lets
ASSERT about that and remove the check. I also fixed the crash bug in
tracing that oysteine@ found when tracing could be turned on in the
middle of style recalc and we'd have missed calling setStatsEnabled at
the start of the recalc.

BUG=501634

Review URL: https://codereview.chromium.org/1199563003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@197513 bbb929c8-8fbe-4397-9dbb-9b2b20218538

Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk