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Ads can appear due to asynchronous ad tag requests completing after earlier ads in a pod have loaded, so remove the requirement that the ad count can't change. The MediaPeriodQueue should handling discarding buffered content if an ad appears before already buffered content, so I think this case is actually handled correctly by the core player already. Also remove the requirement that an ad URI can't change. This is a defensive measure for now, but it's likely that a later fix in the IMA SDK for an issue where loadAd is not called after preloading then seeking before a preloaded ad plays will result in loadAd being called more than once, and I think it's possible that the second call to loadAd may have a different URI. Because the ad URI should only change after an intermediate seek to another MediaPeriod, there shouldn't be any problems with buffered data not getting discarded. Issue: #7477 PiperOrigin-RevId: 316871371