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The error codition occures in the following scenario: A multipart transformer returns a new multipart, that part is listened on, but the subscription for more parts is cancelled. This used to cause cancellation of the byte stream into the multipart parser, which caused the first part to never be read completely. R=lrn@google.com, sgjesse@google.com Review URL: https://codereview.chromium.org//874223002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43726 260f80e4-7a28-3924-810f-c04153c831b5