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

media/cast/net/rtp/rtp_parser_unittest.cc

Index: media/cast/net/rtp/rtp_parser_unittest.cc
diff --git a/media/cast/net/rtp/rtp_parser_unittest.cc b/media/cast/net/rtp/rtp_parser_unittest.cc
index 97d09220270f0acbb9f6e79e42559e931189bd76..b0d7d44dae05f8ab5dba32ced9de6b5e68775a4c 100644
--- a/media/cast/net/rtp/rtp_parser_unittest.cc
+++ b/media/cast/net/rtp/rtp_parser_unittest.cc
@@ -29,7 +29,7 @@ class RtpParserTest : public ::testing::Test {
     packet_builder_.SetMarkerBit(true);  // Only one packet.
     cast_header_.sender_ssrc = kTestSsrc;
     cast_header_.sequence_number = kTestSeqNum;
-    cast_header_.rtp_timestamp = kTestTimestamp;
+    cast_header_.rtp_timestamp = RtpTimeTicks().Expand(kTestTimestamp);
     cast_header_.payload_type = kTestPayloadType;
     cast_header_.marker = true;
   }