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kOnDemand mode isn't being used by default since M75. We are using the
opportunity to deprecate the chrome://flags.

SurfaceLayerMode is still needed because some targets need to disable
the feature.

Bug: 901513
Change-Id: Iaf55a1b583d080ce04379566aaf03deb0b9a9123
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1756396Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719631}