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Motivation of this change was cleaning up value.dart. This also led to finally handling parsing and escaping string literals in a rational way - which accidentally fixed a test. This is intended to setup a future change that can simplify EvaluatedValue hopefully dramatically. Changes to await were required due to refactoring of tree. Review URL: http://codereview.chromium.org//9121025 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@3067 260f80e4-7a28-3924-810f-c04153c831b5