DevTools: [JSDoc] Fix function bind()-ing against their @this annotations

R=vsevik@chromium.org, aandrey, eustas, vsevik

Review URL: https://codereview.chromium.org/202623004

git-svn-id: svn://svn.chromium.org/blink/trunk@169433 bbb929c8-8fbe-4397-9dbb-9b2b20218538