CTTE: Node::treeScope() should return a reference.
<https://webkit.org/b/122399> Reviewed by Superlative Sam. Every Node belongs to a TreeScope. To enforce this, I've made treeScope() return a TreeScope&, and setTreeScope() now takes a TreeScope& so there is no way to clear it. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@156981 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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