[css-flexbox] Resolve Issue 27 for Flexbox per WG resolution from Sophia F2F. (Need more general definition in sizing.) <file:///home/fantasai/w3c/csswg/css-flexbox/issues-lc-20140325.html#issue-27>

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extra : rebase_source : 9267ece0acdee05545dc669ad0c9d68eece541cc
[css-flexbox] Separate out the definition of static position from the definition of static pos *in flexbox*.
Fix conflicts