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

media/cast/receiver/cast_receiver_impl.h

Index: media/cast/receiver/cast_receiver_impl.h
diff --git a/media/cast/receiver/cast_receiver_impl.h b/media/cast/receiver/cast_receiver_impl.h
index 6a6592a6186670c6f6d71a782562194316d5c93a..9f0c7f6bc9f2bac4b80b665426f57949dd073d84 100644
--- a/media/cast/receiver/cast_receiver_impl.h
+++ b/media/cast/receiver/cast_receiver_impl.h
@@ -9,6 +9,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "media/cast/cast_environment.h"
 #include "media/cast/cast_receiver.h"
+#include "media/cast/common/rtp_time.h"
 #include "media/cast/net/pacing/paced_sender.h"
 #include "media/cast/receiver/frame_receiver.h"
 
@@ -63,7 +64,7 @@ class CastReceiverImpl : public CastReceiver {
       const scoped_refptr<CastEnvironment>& cast_environment,
       const AudioFrameDecodedCallback& callback,
       uint32 frame_id,
-      uint32 rtp_timestamp,
+      RtpTimeTicks rtp_timestamp,
       const base::TimeTicks& playout_time,
       scoped_ptr<AudioBus> audio_bus,
       bool is_continuous);
@@ -77,7 +78,7 @@ class CastReceiverImpl : public CastReceiver {
       const scoped_refptr<CastEnvironment>& cast_environment,
       const VideoFrameDecodedCallback& callback,
       uint32 frame_id,
-      uint32 rtp_timestamp,
+      RtpTimeTicks rtp_timestamp,
       const base::TimeTicks& playout_time,
       const scoped_refptr<VideoFrame>& video_frame,
       bool is_continuous);