Revert "Add assert that the root widget has been attached. (#32437)" (#33068)

This reverts commit 069303d46fee7cc995c2ebcf253f7c5a87ab9533.
https://dart.googlesource.com/external/github.com/flutter/flutter/+/e2042bae6df774cc0be2b22d84f3510b93b24748
1 file changed
tree: b7f9ba036eafdb57910b9cf70e8a8afbe7013da8
  1. commits.json