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Convert the V4L2VideoDecodeAccelerator class to use the V4L2Queue. This
considerably reduces its amount of code, while also making buffers
lifecycle safer.

BUG=792790
TEST=Made sure that VDA unittest was compiling and running on Hana

Change-Id: I145778421cfc6d5951249cb9c934ac5e3b1e230b
Reviewed-on: https://chromium-review.googlesource.com/1170707Reviewed-by: Pawel Osciak <posciak@chromium.org>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595372}