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Code does not use these experiment enums anymore. Only kSmoothScrollingDefault
is used to determine how to adjust the viewport insets.

Bug: 914042
Change-Id: I71c4112d7f2f820a4793d74d0c5a0726513f300a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1812121Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699980}