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Largely cleanup in a move from string literals to accessing the corresponding node tokens. I'm also trying on an approach to tracking the need for preceding (and trailing) newlines. In general I don't love state flags where I can avoid them but the alternatives were even more ungainly to my eye. Thoughts, of course, are most welcome! R=brianwilkerson@google.com Review URL: https://codereview.chromium.org//23308004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@26370 260f80e4-7a28-3924-810f-c04153c831b5