RFR: 8231632: HttpURLConnection::usingProxy could specify that it may lazily evaluate the fact

[Julia Boes]

1) Maybe add @Override to `public boolean usingProxy()`. ( pre-existing issue )

2) Maybe move the return on 3040 to a new line. Also use the curly braces consistently, or not at all ;-)

That's right! Thanks for reviewing, Chris. I added those two changes.

Updated webrev: 
http://cr.openjdk.java.net/~jboes/webrevs/8231632/webrev.02/index.html