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github changes: https://github.com/dart-lang/CustomElements/pull/5 R=sra@google.com Review URL: https://codereview.chromium.org//149313004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@32307 260f80e4-7a28-3924-810f-c04153c831b5