DevTools: [JsDoc] Add @this annotation to nested functions using |this|.

Drive-by: fix discovered annotation and logical code errors

R=aandrey, eustas, vsevik

Review URL: https://codereview.chromium.org/104713009

git-svn-id: svn://svn.chromium.org/blink/trunk@163802 bbb929c8-8fbe-4397-9dbb-9b2b20218538