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akling@apple.com authored
<https://webkit.org/b/120566> Reviewed by Darin Adler. Let EditCommand's and all subclass constructors take Document& instead of Document*. EditCommand::document() now returns a Document&. Added Editor::document() which returns Editor::frame().document() after asserting that it's non-null, to make passing a Document& from Editor functions easier. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154938 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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