All child elements of a flex container should be turned into a flex item

All child elements of a flex container should be turned into a flex item
https://bugs.webkit.org/show_bug.cgi?id=90323

Reviewed by Ojan Vafai.

Source/WebCore:

We used to only convert some elements to blocks, but now we convert everything except text nodes.
This was recently changed here:
http://wiki.csswg.org/topics/css3-flexbox-flexbox-replaced-children

Tests: css3/flexbox/anonymous-block.html : Add new test case.
       css3/flexbox/flexitem.html: Update results.

* css/StyleResolver.cpp:
(WebCore::StyleResolver::collectMatchingRulesForList):

LayoutTests:

* css3/flexbox/anonymous-block-expected.html:
* css3/flexbox/anonymous-block.html:
* css3/flexbox/flexitem-expected.txt:
* css3/flexbox/flexitem.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121613 268f45cc-cd09-0410-ab3c-d52691b4dbfc