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Mostly the push of 'assertSuccessfulRefactoring' into abstract RefactoringTest. R=brianwilkerson@google.com BUG= Review URL: https://codereview.chromium.org//516673002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@39658 260f80e4-7a28-3924-810f-c04153c831b5