Remove TargetedStyleRecalc runtime flag.

The flag has had status=stable for more than 4 months.

R=chrishtr@chromium.org,esprehn@chromium.org,abarth@chromium.org

Review URL: https://codereview.chromium.org/562403002

git-svn-id: svn://svn.chromium.org/blink/trunk@182098 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r182085

http://src.chromium.org/viewvc/blink?view=revision&revision=182085

TBR=jchaffraix@chromium.org

Review URL: https://codereview.chromium.org/580573002

git-svn-id: svn://svn.chromium.org/blink/trunk@182099 bbb929c8-8fbe-4397-9dbb-9b2b20218538