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As part fixing washed out colors due to changes to a
combination of chromaticity and luminosity changes,
color spaces were pinned to sRGB for SDR content instead
of using the full native color space to boost saturation.

Now that other fixes have stabilized the situation, use
the native color space.

Bug: b:158126931
Change-Id: I57140d31897a3aaf5d8a4debeff99e4db5ea76d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415269
Commit-Queue: Jao-ke Chin-Lee <jchinlee@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808507}