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KernelTarget already uses IncrementalClassHierarchy, and other clients either need ClosedWorldClassHierarchy, so should explicitly create it, or don't care, and can be switched to IncrementalClassHierarchy. R=ahe@google.com, kmillikin@google.com, paulberry@google.com, sigmund@google.com BUG= Review-Url: https://codereview.chromium.org/2930973002 .