Utilize |editing.dom.ancestors| in |normalizeSelectedStartNode()| to use |for-of|.
unlink: Make "unlink.contents.partial.anchor.focus" to pass test.
Revert "Utilize |editing.dom.ancestors| in |normalizeSelectedStartNode()| to use |for-of|."

This reverts commit bcaabdff1f747e66f30a6c258dd2beb446f0e519.

Because closure-compiler can't compiler |for-of| with |break| in version v20140923.
Changes for pass closure compiler.
Make |editing.dom.computeSelectedNodes()| simpler.
unlink: Reorder phrasing elemetns in A element.
Fix #8