Revert "Remove obsolete float-management code from line layout"

Revert "Remove obsolete float-management code from line layout"

This reverts commit 52100348948ad90e4bce5256383fbe19eca64554.

Reason for revert: caused issues with layout identified in crbug.com/498664.

BUG=498664, 487775
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=196896

[rhogan, 2015-06-10 18:39:50]

The CQ bit was checked by robhogan@gmail.com

[commit-bot: I haz the power, 2015-06-10 18:40:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1175953003/1

[commit-bot: I haz the power, 2015-06-10 18:40:06]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-10 18:40:07]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[rhogan, 2015-06-10 18:40:23]

robhogan@gmail.com changed reviewers:
+ mstensho@opera.com

[mstensho (USE GERRIT), 2015-06-10 20:05:50]

The CQ bit was checked by mstensho@opera.com

[mstensho (USE GERRIT), 2015-06-10 20:05:50]

lgtm

[commit-bot: I haz the power, 2015-06-10 20:06:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1175953003/1

[commit-bot: I haz the power, 2015-06-10 20:10:43]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=196896