Remove setTimeout from stylesheet-tracking-restart.htmt protocol test

This patch removes setTimeout call from stylesheet-tracking-restart.html
protocol test as it might be accidentally left there after debugging.

TBR=vsevik

Review URL: https://codereview.chromium.org/146693017

git-svn-id: svn://svn.chromium.org/blink/trunk@166214 bbb929c8-8fbe-4397-9dbb-9b2b20218538