[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

Brendan Long <self> changed:

           What    |Removed                     |Added
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                 CC|                            |self at brendanlong.com

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