[Bug 702195] playbin: Emit {audio,text,video}-changed signals when pads are removed

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=702195
  GStreamer | gst-plugins-base | git

--- Comment #1 from Brendan Long <self at brendanlong.com> 2013-06-13 17:15:12 UTC ---
The switch is duplicated in both pieces of code, but I can't decide if it would
be worthwhile to have a `get_changed_signal(GstPlaySinkType)` function.

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