…gins"

This reverts commit a445d168b9f54cc8902f8bac8da3bc490e441059.

Reason for revert: It caused a performance regression (issue #1002700)

Original change's description:
> [css-grid] Clear the override width for computing percent margins
>
> When calculating the min-content contribution of a grid item of an auto
> sized grid track we must consider the grid item's margin. When the grid
> item's area is indefinite, a percent margin is resolved to zero.
> However, when performing a relayout, the percent margin may be solved
> against the previously computed grid area, since the grid item has
> already an OverrideContainingBlockLogicalWidth value.
>
> In order to re-compute the percent margin properly, we need to clear
> the previously override value. It's important be careful of not
> clearing the override value set during intrinsic size, since we need
> it for the actual layout phase. Hence, we only reset the 'override'
> value when we are executing a definite strategy.
>
> Bug: 834643
> Change-Id: Ib936b26bee1da76afbdc886eb775746e13d40988
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1782840
> Commit-Queue: Javier Fernandez <jfernandez@igalia.com>
> Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#694849}

TBR=cbiesinger@chromium.org,jfernandez@igalia.com,rego@igalia.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 834643, 1002700
Change-Id: I66f2b94417be0c74dc408bc55eee3a8d44447480
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1796803
Reviewed-by: Javier Fernandez <jfernandez@igalia.com>
Commit-Queue: Javier Fernandez <jfernandez@igalia.com>
Cr-Commit-Position: refs/heads/master@{#695531}