TorDomainIsolator routinely clears Android browser circuit data

Our current implementation of TorDomainIsolator.#clearKnownCircuits was built for desktop, but also runs on Android.

On Android Services.wm.getEnumerator("navigator:browser") returns [], so #browsers and #knownCircuits will be entirely cleared. This will effect getCircuit, which I don't believe has any active path on android, but would be used for #41234 (moved).

/cc @pierov

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