remove unused local variables
remove unused local variables

devoncarew/markd,devoncarew/markd,srawlins/dart-markdown,dart-lang/markdown,srawlins/dart-markdown,tomyeh/markd,dart-lang/markdown,dart-lang/markdown,meflyup/markdown,meflyup/markdown,johnpryan/dart-markdown,srawlins/dart-markdown,tomyeh/markd,dpeek/dart-markdown,tomyeh/markd,dpeek/dart-markdown