Merge handleSpecialChild into layoutBlockChildren
https://bugs.webkit.org/show_bug.cgi?id=110165

Reviewed by Darin Adler.

Merge handleSpecialChild, handlePositionedChild, and handleFloatingChild into layoutBlockChildren
to make the semantics of the code clear and to get rid of the outdated comment about how there are
four types of four types of special children.

* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::layoutBlockChildren):
* rendering/RenderBlock.h:
(RenderBlock):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143290 268f45cc-cd09-0410-ab3c-d52691b4dbfc