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systemhtml.py is dependent on it. I believe it was inadvertently working until now because the compiled .pyc file was picked instead. TBR=efortuna@google.com Review URL: https://chromiumcodereview.appspot.com//10917155 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@12089 260f80e4-7a28-3924-810f-c04153c831b5