Remove dubious part from fast/block/margin-collapse/self-collapsing-cols-creates-block-formatting-c…

Remove dubious part from fast/block/margin-collapse/self-collapsing-cols-creates-block-formatting-context.html

The test had invalid column-span:all elements, i.e. there was no multicol
containing block. The new multicol implementation ignores all effects of
column-span:all unless it's a valid one, while the old / current implementation
doesn't.

BUG=386567
R=rune@opera.com

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=192236

[rune, 2015-03-20 09:22:51]

lgtm

[mstensho (USE GERRIT), 2015-03-20 10:23:16]

The CQ bit was checked by mstensho@opera.com

[commit-bot: I haz the power, 2015-03-20 10:23:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1020923002/1

[commit-bot: I haz the power, 2015-03-20 10:27:23]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=192236