FlameChart: fix flame chart styles after pfeldman's flex: auto change.

BUG=
R=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/135273012

git-svn-id: svn://svn.chromium.org/blink/trunk@166108 bbb929c8-8fbe-4397-9dbb-9b2b20218538