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There is a race-condition on Windows and exit handling when a process has been closed is incorrect. R=sgjesse@google.com BUG= TEST= Review URL: https://chromiumcodereview.appspot.com//9307033 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@3790 260f80e4-7a28-3924-810f-c04153c831b5