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This was added in https://crbug.com/470640 which predated the cc scroll
tree.

Change-Id: If47c0665f90b16f5b134d81d2388c1349af77cd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2102628Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750309}