An object may become a column spanner or cease to be one even if column-span doesn't change.

An object may become a column spanner or cease to be one even if column-span doesn't change.

If something with column-span:all becomes floated or out-of-flow
positioned, it ceases to be a spanner. And conversely, if something
with column-span:all is floated or out-of-flow positioned, and later
on becomes non-floated in-flow, it becomes a spanner.

Since we need to cope with such situations, there's no point in
forcing a layout object reattach when the value of column-span
changes, so removed that check.

BUG=497195
R=dsinclair@chromium.org,jchaffraix@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=196679

[dsinclair, 2015-06-08 16:04:54]

The CQ bit was checked by dsinclair@chromium.org

[dsinclair, 2015-06-08 16:04:55]

lgtm

[commit-bot: I haz the power, 2015-06-08 16:05:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162253006/1

[commit-bot: I haz the power, 2015-06-08 16:08:43]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=196679