DevTools: Fix devtools sanity test for shared work (blink side)

BUG=100538
R=yurys

Review URL: https://codereview.chromium.org/686803002

git-svn-id: svn://svn.chromium.org/blink/trunk@184545 bbb929c8-8fbe-4397-9dbb-9b2b20218538