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A input stream obtained from File.openInputStream() can now be used with code that expects data and close callbacks. Before the input stream obtained from File.openInputStream() did not generate any callbacks. R=ager@google.com BUG= TEST= Review URL: http://codereview.chromium.org//8819021 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@2166 260f80e4-7a28-3924-810f-c04153c831b5