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Not waiting for the underlying file to actually close before setting streamMarkedClosed can lead to too early close callbacks. R=sgjesse@google.com BUG=dart:1922 TEST=standalone/FileTest.dart Review URL: https://chromiumcodereview.appspot.com//9540009 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@4754 260f80e4-7a28-3924-810f-c04153c831b5