Revert of Refactor avoidsFloats() to reflect CSS2.1 spec more clearly

Revert of Refactor avoidsFloats() to reflect CSS2.1 spec more clearly (https://codereview.chromium.org/268833003/)

Reason for revert:
Causing clusterfuzz crashes
BUG=388757
Original issue's description:
> Refactor avoidsFloats() to reflect CSS2.1 spec more clearly
> 
> Introduce the 'createsBlockFormatting' concept to RenderBlock::avoidsFloats()
> and remove a couple of now-redundant virtualizations of the function.
> 
> BUG=
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=173549
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=176557

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=176943

[rhogan, 2014-06-25 17:20:41]

Created Revert of Refactor avoidsFloats() to reflect CSS2.1 spec more clearly

[commit-bot: I haz the power, 2014-06-25 17:21:49]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/robhogan@gmail.com/330913007/1

[commit-bot: I haz the power, 2014-06-25 17:21:51]

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

[commit-bot: I haz the power, 2014-06-25 17:21:51]

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 or
a provisional 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, 2014-06-25 17:30:04]

lgtm

[commit-bot: I haz the power, 2014-06-25 17:30:46]

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

[commit-bot: I haz the power, 2014-06-25 17:30:46]

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 or
a provisional 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.

[inferno, 2014-06-25 17:40:12]

lgtm

[rhogan, 2014-06-25 18:11:45]

The CQ bit was checked by robhogan@gmail.com

[commit-bot: I haz the power, 2014-06-25 18:11:56]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/robhogan@gmail.com/330913007/1

[commit-bot: I haz the power, 2014-06-25 19:16:23]

Change committed as 176943