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Although EncodeJob is treated with scoped_refptr, its ownership is not shared at
all. Therefore, this CL lets EncodeJob treat with std::unique_ptr in order to
clarify its ownership and improve a performance a little bit.

Bug: 1016219
Test: vaapi_video_encode_accelerator_unittest on atlas
Test: https://appr.tc/?debug=loopback&vsc=vp8
Change-Id: Ib7f5c5fda806b11e590e9dd219c585900ae52b57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874992Reviewed-by: Pawel Osciak <posciak@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710198}