MTP: Clear cache and emit delete events when an object is removed.
MTP: Clear cache and emit delete events when an object is removed.

If an object is reported as removed by the device, remove it from
the cache and emit a delete event for it.

https://bugzilla.gnome.org/show_bug.cgi?id=696016

gicmo/gvfs,gicmo/gvfs,halfline/gvfs,halfline/gvfs,gicmo/gvfs,xkahn/gvfs-cmis,xkahn/gvfs-cmis,xkahn/gvfs-cmis,xkahn/gvfs-cmis,halfline/gvfs,gicmo/gvfs