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01ae2b047f
Whether a resource resolves to a known length or not is more than just a property of the resource & data source - for example if `DataSpec.flags` contains `ALLOW_GZIP` then the length might be unresolved. More generally, a `DataSource` could randomly return `C.UNKNOWN_LENGTH` from `open()` 50% of the time and still fulfil the `DataSource` interface. This makes it ~impossible to write a meaningful assertion aroun this. So this change relaxes the assertion slightly to more closely match the definition of the `DataSource` interface. We leave the `resolveToUnknownLength` toggle in `WebServerDispatcher.Resource` because this is still useful for simulating the case of a server that is serving a file it doesn't know the length of. PiperOrigin-RevId: 351124246