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These were added in 7e5d63513a7ae854605dbd38582cead55594e9f0 for use in _handleNavigationMessage. That function was deleted in f37aafd456fc6a1c2dba5bc1b63123b0e665e6cd, but the support methods were left in the code. `// ignore: unused` annotations were added to all private native entry points by dnfield (to work around what is arguably a bug) in 6179ac637724e8f93b7f3c8dcfda93a6b9b7995e, and were applied to these two methods, I suspect unintentionally. In any case, they appear entirely unused at present.