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This piece of code was originally introduced in:
https://chromium.googlesource.com/chromium/src/+/493129de0e666cb0b6fd6bf966a0993aa3d64be5

This had the effect of considering the margin-block-end of a LayoutBox
as scrollable overflow.

This wasn't in any specification.

This appears to be trying to replicate an effect from FF, however this
only occurs for FF on the root scroller, not arbitrary scrollers like
this does.

Fortunately Safari never shipped this behaviour.

Bug: 34224
Change-Id: I1a2d45f598fb44955cc39017d70b126221d57a96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2371203Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800987}