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This brings RN up to date with facebook/react#7472 (scheduled for React 15.3.1).
If you use React 15.3.1 with RN without this patch, Systrace output will lack the reconciler events.
(Since it’s a niche feature it didn’t seem to me that full backward compat is necessary so I just removed old hooks. This won’t cause crashes—it’s just you won’t get events in Systrace if you use new React but old RN.)
Test plan: careful examination. I haven’t actually tested this.
I can test it next week unless somebody beats me to it.