GDBusConnection: Don't store GCancellable in qdata
GDBusConnection: Don't store GCancellable in qdata

Now that we're using g_simple_async_result_set_check_cancellable() we
no longer need this terrible hack of carrying the GCancellable on the
GSimpleAsyncResult using qdata. See bug 672013 for more details.

https://bugzilla.gnome.org/show_bug.cgi?id=672013

Signed-off-by: David Zeuthen <16a4bae6a7afea1fdd75baca6404fe68f285db96@redhat.com>

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