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Revert "Make initialSemanticsTreeCreation less sensitive to GC timing. (#19491)"

This reverts commit 3840719987c4b42e7b8a5557c3b47de73bae400f.

Bug: https://github.com/flutter/flutter/issues/19435
R
Ryan Macnak committed
68b0ba9d4b5f55e64c6bcf29f49ac4b66753506e
Parent: 12aa7ec