Returns the Chromote package's default Chromote object. If
there is not currently a default Chromote object that is active, then
one will be created and set as the default.
default_chromote_object()has_default_chromote_object()
set_default_chromote_object(x)
A Chromote object.
ChromoteSession$new() calls this function by default, if the
parent is not specified. That means that when
ChromoteSession$new() is called and there is not currently an
active default Chromote object, then a new Chromote object will
be created and set as the default.