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 68607977ecb287c6cff2df5814ce298af1760ae7..9eab12225eb746b23b5d76b5870f833dac07ac6d 100644
--- a/media/cast/cast_defines.h
+++ b/media/cast/cast_defines.h
@@ -18,11 +18,6 @@ inline bool IsNewerFrameId(uint32 frame_id, uint32 prev_frame_id) {
          static_cast<uint32>(frame_id - prev_frame_id) < 0x80000000;
 }
 
-inline bool IsNewerRtpTimestamp(uint32 timestamp, uint32 prev_timestamp) {
-  return (timestamp != prev_timestamp) &&
-         static_cast<uint32>(timestamp - prev_timestamp) < 0x80000000;
-}
-
 inline bool IsOlderFrameId(uint32 frame_id, uint32 prev_frame_id) {
   return (frame_id == prev_frame_id) || IsNewerFrameId(prev_frame_id, frame_id);
 }
@@ -38,16 +33,6 @@ inline bool IsNewerSequenceNumber(uint16 sequence_number,
   return IsNewerPacketId(sequence_number, prev_sequence_number);
 }
 
-inline base::TimeDelta RtpDeltaToTimeDelta(int64 rtp_delta, int rtp_timebase) {
-  DCHECK_GT(rtp_timebase, 0);
-  return rtp_delta * base::TimeDelta::FromSeconds(1) / rtp_timebase;
-}
-
-inline int64 TimeDeltaToRtpDelta(base::TimeDelta delta, int rtp_timebase) {
-  DCHECK_GT(rtp_timebase, 0);
-  return delta * rtp_timebase / base::TimeDelta::FromSeconds(1);
-}
-
 }  // namespace cast
 }  // namespace media