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During computing the size of an SVG we may end up calling:
ContainingBlock()->AvailableLogicalWidth()

This is invalid inside LayoutNG as we should always use the override
set by the LayoutNG algorithm.

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: Ia9f32ac921726cf3f3f0d76dcccd2a0497cb25cf
Bug: 	635619
Reviewed-on: https://chromium-review.googlesource.com/1255598
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595778}