Test window.navigator.userAgent for truth instead of against null.
Test window.navigator.userAgent for truth instead of against null.

We're about to add a patch where it can be undefined rather than null.
See https://trac.torproject.org/projects/tor/ticket/9069#comment:8.

glamrock/flashproxy,infinity0/flashproxy,glamrock/flashproxy,arlolra/flashproxy,arlolra/flashproxy,arlolra/flashproxy,arlolra/flashproxy,arlolra/flashproxy,infinity0/flashproxy,glamrock/flashproxy,infinity0/flashproxy,arlolra/flashproxy,glamrock/flashproxy,infinity0/flashproxy,glamrock/flashproxy,infinity0/flashproxy,arlolra/flashproxy,infinity0/flashproxy,glamrock/flashproxy