Revert of Flip the TargetedStyleRecalc flag to status=stable. (https://codereview.chromium.org/163613010/)

Reason for revert:
Broke DataGrids in DevTools. Please see crbug.com/344445

Original issue's description:
> Flip the TargetedStyleRecalc flag to status=stable.
> 
> BUG=335247
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=167245

TBR=ojan@chromium.org,eseidel@chromium.org,chrishtr@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=335247

Review URL: https://codereview.chromium.org/170303002

git-svn-id: svn://svn.chromium.org/blink/trunk@167316 bbb929c8-8fbe-4397-9dbb-9b2b20218538