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The Chromium smart pointer guidelines [1] says "don't pass or return a
smart pointer by reference". This CL remove "const scoped_refptr<T>&"
at VaapiPicture.

[1] https://www.chromium.org/developers/smart-pointer-guidelines

Bug: 1020668
Test: run vda_tests on octopus

Change-Id: I7b1c8d4066a6bba0d5ded4b1b584278168c49eea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974725
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726365}