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This may happen if children acquire scrollbars.

Change-Id: Iafd48e0f1afc927e8723f3a2f57b6dddf3157fd1
Reviewed-on: https://chromium-review.googlesource.com/889904Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533053}