Don't use raw protocol data in inspector/timeline/timeline-script-tag-1.html

BUG=398785
R=alph@chromium.org

Review URL: https://codereview.chromium.org/487763002

git-svn-id: svn://svn.chromium.org/blink/trunk@180547 bbb929c8-8fbe-4397-9dbb-9b2b20218538