Remove testRunner.globalFlag use from layout tests outside http/security

BUG=405846
R=esprehn@chromium.org

Review URL: https://codereview.chromium.org/475933003

git-svn-id: svn://svn.chromium.org/blink/trunk@180788 bbb929c8-8fbe-4397-9dbb-9b2b20218538