nsIFile delete changed to remove

[Pete Collins]

I am checking in a name change for the nsIFIle method delete.

old name -> void delete(in boolean recursive);
new name -> void remove(in boolean recursive);

delete is a javascript keyword.

remove is a canonical libc method name, so the change shouldn't cause 
much mental overhead.

Please see this bug:

http://bugzilla.mozilla.org/show_bug.cgi?id=37406

Thanks

--pete