* net/dbus.el (top): Don't register for "NameOwnerChanged".

* net/dbus.el (top): Don't register for "NameOwnerChanged".
(dbus-message-type-invalid, dbus-message-type-method-call)
(dbus-message-type-method-return, dbus-message-type-error)
(dbus-message-type-signal): New defconst.
(dbus-ignore-errors): Fix `edebug-form-spec' property.
(dbus-return-values-table): New defvar.
(dbus-call-method-non-blocking-handler, dbus-event-message-type):
New defun.
(dbus-check-event, dbus-handle-event, dbus-event-serial-number, ):
Extend docstring.  Adapt implementation according to new
`dbus-event' layout.
(dbus-event-service-name, dbus-event-path-name)
(dbus-event-interface-name, dbus-event-member-name): Adapt
implementation according to new `dbus-event' layout.
(dbus-set-property): Correct `dbus-introspect-get-attribute' call.