/usr/share/vala-0.20/vapi/gstreamer-app-0.10.deps is in valac-0.20-vapi 0.20.1-2ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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gstreamer-0.10 gstreamer-base-0.10 gmodule-2.0