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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 V4L2 VEA and VDA.

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

Bug: 1020668
Test: run vda_tests on kevin

Change-Id: I577ecf143f48f5fd3b0749a7a964e84ef1533cbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974722
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726302}