[New multicol] Avoid 1px tall multicol if percent height is unresolvable.

[New multicol] Avoid 1px tall multicol if percent height is unresolvable.

If a box has a percentage height, but the computed height of its
containing block is auto, the computed height of the box also becomes
auto. computeContentLogicalHeight() returns -1 if the height isn't
resolvable, and we need to make sure that such a value doesn't
constrain the height of the multicol container.

This is a merge of https://bugs.webkit.org/show_bug.cgi?id=122826
Reviewed in WebKit by David Hyatt.

BUG=342779
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=166974

[ojan, 2014-02-12 00:27:50]

lgtm

[commit-bot: I haz the power, 2014-02-12 01:59:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mstensho@opera.com/144463015/1

[commit-bot: I haz the power, 2014-02-12 07:44:36]

Change committed as 166974