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We are deprecating --clear_safari_cache in favor of a more general flag the individual browser implementations can use. R=whesse@google.com Review URL: https://codereview.chromium.org//257803014 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@35483 260f80e4-7a28-3924-810f-c04153c831b5