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The handler function for a native isolate no longer gets an explicit reply port. Instead the reply port must be sent as part of the message if required. The Dart_CObject structure now exposes the send ports in a message to a native isolate. R=asiva@google.com, floitsch@google.com, whesse@google.com BUG= Review URL: https://codereview.chromium.org//43483004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29418 260f80e4-7a28-3924-810f-c04153c831b5