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1. Subclassing does not change resolution, so we need to invalidate only HINTS (for invalid @override) and VERIFY_ERRORS (for unimplemented or type-conflicting (from multiple supers) members). 2. OTOH instantiation of a class with a (members) delta does not change nor resolution, not the set of errors. R=brianwilkerson@google.com BUG= Review URL: https://codereview.chromium.org/2138603002 .