@AaronvanW addendum: it looks like the 1 MB limit did have an activation flag height. There's actually 3 commits:
1. introduce the limit: https://github.com/bitcoin/bitcoin/commit/a30b56ebe76ffff9f9cc8a6667186179413c6349
2. set a flag height: https://github.com/bitcoin/bitcoin/commit/f1e1fb4bdef878c8fc1564fa418d44e7541a7e83#diff-118fcbaaba162ba17933c7893247df3aR1421
3. remove the flag height (presumably once it was active): https://github.com/bitcoin/bitcoin/commit/172f006020965ae8763a0610845c051ed1e3b522
The changes are buried deep inside innocuously named commits. Don't get lazy with code review...
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