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

media/cast/logging/stats_event_subscriber.h

Index: media/cast/logging/stats_event_subscriber.h
diff --git a/media/cast/logging/stats_event_subscriber.h b/media/cast/logging/stats_event_subscriber.h
index 36d5110777333216a09fc846c28f6fa81eb594b7..f831cd80a6d5633d666563329f8e3e48f8a78062 100644
--- a/media/cast/logging/stats_event_subscriber.h
+++ b/media/cast/logging/stats_event_subscriber.h
@@ -182,10 +182,9 @@ class StatsEventSubscriber : public RawEventSubscriber {
 
   typedef std::map<CastStat, double> StatsMap;
   typedef std::map<CastStat, linked_ptr<SimpleHistogram> > HistogramMap;
-  typedef std::map<RtpTimestamp, FrameInfo> FrameInfoMap;
-  typedef std::map<
-      std::pair<RtpTimestamp, uint16>,
-      std::pair<base::TimeTicks, CastLoggingEvent> >
+  typedef std::map<RtpTimeTicks, FrameInfo> FrameInfoMap;
+  typedef std::map<std::pair<RtpTimeTicks, uint16>,
+                   std::pair<base::TimeTicks, CastLoggingEvent>>
       PacketEventTimeMap;
   typedef std::map<CastLoggingEvent, FrameLogStats> FrameStatsMap;
   typedef std::map<CastLoggingEvent, PacketLogStats> PacketStatsMap;
@@ -203,7 +202,7 @@ class StatsEventSubscriber : public RawEventSubscriber {
   void UpdateFirstLastEventTime(base::TimeTicks timestamp,
                                 bool is_receiver_event);
   bool GetReceiverOffset(base::TimeDelta* offset);
-  void MaybeInsertFrameInfo(RtpTimestamp rtp_timestamp,
+  void MaybeInsertFrameInfo(RtpTimeTicks rtp_timestamp,
                             const FrameInfo& frame_info);
   void RecordFrameCaptureTime(const FrameEvent& frame_event);
   void RecordCaptureLatency(const FrameEvent& frame_event);