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I have attempted to deal with them correctly instead of ignoring them so that they can be passed on unchanged to subprocesses. R=johnniwinther@google.com BUG= TEST= Review URL: https://chromiumcodereview.appspot.com//10689065 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@9284 260f80e4-7a28-3924-810f-c04153c831b5