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This paves the way for replacing these data structures with ForStatement2Impl, by making them expose the same set of child nodes that ForStatement2Impl would. This required some fixes in the implementations of completion and refactoring, since they make assumptions about the relationships between nodes and their children. Change-Id: I35e2873fcee2c88215c51c5caa5318934fc2a1a8 Reviewed-on: https://dart-review.googlesource.com/c/94401 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Paul Berry <paulberry@google.com>