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- Simplify inferencing of boxed variables. They are now inferred the same way as fields. - Move the code to handle field initialization into its own class. - Only track field initializations in generative constructors. R=ahe@google.com Review URL: https://codereview.chromium.org//19784005 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@25338 260f80e4-7a28-3924-810f-c04153c831b5