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akling@apple.com authored
<https://webkit.org/b/120496> Reviewed by Antti Koivisto. Now that orphan DocumentType nodes also have document pointers, it's no longer possible to have a null Node::document(). Cement this by making document() return a reference, and remove the various null checks exposed by this. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154877 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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