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So, we can have more than one index and server running. And we know when it is time to delete or recreate this temporary directory. R=paulberry@google.com BUG= https://code.google.com/p/dart/issues/detail?id=20240 Review URL: https://codereview.chromium.org//426773002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@38652 260f80e4-7a28-3924-810f-c04153c831b5