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

media/cast/logging/log_deserializer.h

Index: media/cast/logging/log_deserializer.h
diff --git a/media/cast/logging/log_deserializer.h b/media/cast/logging/log_deserializer.h
index 01b6db7dd1220669d6f3337245fc42dd95ef68e9..c9d4c7249729394caa7be5e41e0d751c5d0924e6 100644
--- a/media/cast/logging/log_deserializer.h
+++ b/media/cast/logging/log_deserializer.h
@@ -15,11 +15,11 @@
 namespace media {
 namespace cast {
 
-typedef std::map<RtpTimestamp,
-                 linked_ptr<media::cast::proto::AggregatedFrameEvent> >
+typedef std::map<RtpTimeTicks,
+                 linked_ptr<media::cast::proto::AggregatedFrameEvent>>
     FrameEventMap;
-typedef std::map<RtpTimestamp,
-                 linked_ptr<media::cast::proto::AggregatedPacketEvent> >
+typedef std::map<RtpTimeTicks,
+                 linked_ptr<media::cast::proto::AggregatedPacketEvent>>
     PacketEventMap;
 
 // Represents deserialized raw event logs for a particular stream.