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

media/cast/net/mock_cast_transport_sender.h

Index: media/cast/net/mock_cast_transport_sender.h
diff --git a/media/cast/net/mock_cast_transport_sender.h b/media/cast/net/mock_cast_transport_sender.h
index 1fd4b5700011388504953dd973128c8c58ed6e85..371b419251c96ce0b5589039fbb441a4685fbba7 100644
--- a/media/cast/net/mock_cast_transport_sender.h
+++ b/media/cast/net/mock_cast_transport_sender.h
@@ -30,9 +30,10 @@ class MockCastTransportSender : public CastTransportSender {
   MOCK_METHOD3(SendSenderReport,
                void(uint32_t ssrc,
                     base::TimeTicks current_time,
-                    uint32_t current_time_as_rtp_timestamp));
-  MOCK_METHOD2(CancelSendingFrames,
-               void(uint32_t ssrc, const std::vector<uint32_t>& frame_ids));
+                    RtpTimeTicks current_time_as_rtp_timestamp));
+  MOCK_METHOD2(CancelSendingFrames, void(
+      uint32_t ssrc,
+      const std::vector<uint32_t>& frame_ids));
   MOCK_METHOD2(ResendFrameForKickstart, void(uint32_t ssrc, uint32_t frame_id));
   MOCK_METHOD0(PacketReceiverForTesting, PacketReceiverCallback());
   MOCK_METHOD1(AddValidSsrc, void(uint32_t ssrc));