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These were added in 44ec9e55c9fb38dd8f94ebee3a19190472087c2c for use in _handleNavigationMessage. That function was deleted in 0dd69f7b077bcde683df73f00a90ecacaa08df28, 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 2eae3feaafe2e95158d6b596acdfdbf346f60d98, and were applied to these two methods, I suspect unintentionally. In any case, they appear entirely unused at present.