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getField and setField as synchronous calls that accept isolate-local object as arguments. Originally reviewed as https://codereview.chromium.org/14044007/ Review URL: https://codereview.chromium.org//13942008 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@21591 260f80e4-7a28-3924-810f-c04153c831b5