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+ return response if client specifies inaccessible sdk + cleanup JSON encode/decode references + cleanup channel close processing R=brianwilkerson@google.com Review URL: https://codereview.chromium.org//187603010 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@33355 260f80e4-7a28-3924-810f-c04153c831b5