Remove kV99StreamIdIncrement from QuicStreamIdManager. It's hard coded with the same value as QuicUtils::StreamIdDelta(). There should be only one source of truth. gfe-relnote: no behavior change. not protected. PiperOrigin-RevId: 304467242 Change-Id: I81861a89c913d033212d6c5e86181c7cd92636b7