Replace uses of raw uint32's with a type-checked RtpTimeTicks data type.

media/cast/cast_defines.h

Index: media/cast/cast_defines.h
diff --git a/media/cast/cast_defines.h b/media/cast/cast_defines.h
index 2da7ddc5e715240c5d994f7a4d0cd578f5e7f76b..cef95b2fd55720a195058ca97a87ed7e468f568c 100644
--- a/media/cast/cast_defines.h
+++ b/media/cast/cast_defines.h
@@ -20,11 +20,6 @@ inline bool IsNewerFrameId(uint32_t frame_id, uint32_t prev_frame_id) {
          static_cast<uint32_t>(frame_id - prev_frame_id) < 0x80000000;
 }
 
-inline bool IsNewerRtpTimestamp(uint32_t timestamp, uint32_t prev_timestamp) {
-  return (timestamp != prev_timestamp) &&
-         static_cast<uint32_t>(timestamp - prev_timestamp) < 0x80000000;
-}
-
 inline bool IsOlderFrameId(uint32_t frame_id, uint32_t prev_frame_id) {
   return (frame_id == prev_frame_id) || IsNewerFrameId(prev_frame_id, frame_id);
 }
@@ -40,17 +35,6 @@ inline bool IsNewerSequenceNumber(uint16_t sequence_number,
   return IsNewerPacketId(sequence_number, prev_sequence_number);
 }
 
-inline base::TimeDelta RtpDeltaToTimeDelta(int64_t rtp_delta,
-                                           int rtp_timebase) {
-  DCHECK_GT(rtp_timebase, 0);
-  return rtp_delta * base::TimeDelta::FromSeconds(1) / rtp_timebase;
-}
-
-inline int64_t TimeDeltaToRtpDelta(base::TimeDelta delta, int rtp_timebase) {
-  DCHECK_GT(rtp_timebase, 0);
-  return delta * rtp_timebase / base::TimeDelta::FromSeconds(1);
-}
-
 }  // namespace cast
 }  // namespace media