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Use this to replace subclasses of SimpleConfiguration that mostly override members to replace behavior with no-op BUG= https://code.google.com/p/dart/issues/detail?id=12495 R=gram@google.com Review URL: https://codereview.chromium.org//22999020 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@26316 260f80e4-7a28-3924-810f-c04153c831b5