DevTools: Do not reveal all files in navigator for workers.
DevTools: Do not reveal all files in navigator for workers.

R=loislo

Review URL: https://codereview.chromium.org/474563003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@180738 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs