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Behavior has changed since custom elements are no longer being upgraded when in templates. BUG=16656 R=vsm@google.com Review URL: https://codereview.chromium.org//151563006 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@32607 260f80e4-7a28-3924-810f-c04153c831b5