[Bug 764316] vaapidecode: simplify downstream negotiation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764316

--- Comment #2 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 324951
  --> https://bugzilla.gnome.org/attachment.cgi?id=324951&action=edit
simplify the downstream renegotiation

This patch is a simplification of the last commits regarding the downstream
renegotiation given the processed surface.

This simplification is oriented to avoid the duplication of responsibilities
with GstVideoDecoder super-class, in particular with those related with the
pool negotiation.

As a side gain some global state variables are now unneeded.

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