[Bug 678389] subtitle elements: use GstVideoOverlayComposition

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=678389
  GStreamer | gst-plugins-bad | git

Bug 678389 depends on bug 678384, which changed state.

Bug 678384 Summary: [API] [GstVideoOverlayComposition] port to 0.11
https://bugzilla.gnome.org/show_bug.cgi?id=678384

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

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