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akling@apple.com authored
<https://webkit.org/b/122435> Reviewed by Sam Weinig. Source/WebCore: Make all Range constructors take Document& instead of a PassRefPtr. This removes one null check at every call site. Also use a Ref<Document> for storage in Range. Source/WTF: Give Ref an assignment operator. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157018 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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