player.ads.updateUsPrivacyString(callback) would not invoke the callback if the USP API was not present in the current window or any parent window. Now it is synchronously invoked with a null privacyString, so updateUsPrivacyString() can be used safely when the presence of the USP API is uncertain.
Description
player.ads.updateUsPrivacyString(callback)would not invoke the callback if the USP API was not present in the current window or any parent window. Now it is synchronously invoked with anullprivacyString, soupdateUsPrivacyString()can be used safely when the presence of the USP API is uncertain.