Revert "Merge pull request #12208 from mjhoy/patch-1"
Revert "Merge pull request #12208 from mjhoy/patch-1"

This reverts commit ab5cd54b7e791f8419f689d1bef5394890268a6f, reversing
changes made to cdc10c898d4865302740340eedec4f5f4ca76565.

Reason: This way of defining root path is still supported. See
https://github.com/rails/rails/blob/d262773ab7f0aae5de2d354ac2eca168e95b653d/actionpack/test/controller/routing_test.rb#L450-457

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