Fix size_t truncations in media for 64-bit VS 2015

media/cast/net/rtcp/rtcp_builder_unittest.cc

Index: media/cast/net/rtcp/rtcp_builder_unittest.cc
diff --git a/media/cast/net/rtcp/rtcp_builder_unittest.cc b/media/cast/net/rtcp/rtcp_builder_unittest.cc
index 6bd9d0581221498358f5e09ac3dda707b391e2a1..faf34551c6786bb5c418e5ae41adc5694569c01e 100644
--- a/media/cast/net/rtcp/rtcp_builder_unittest.cc
+++ b/media/cast/net/rtcp/rtcp_builder_unittest.cc
@@ -413,8 +413,9 @@ TEST_F(RtcpBuilderTest, RtcpReceiverReportRedundancy) {
         time_base_ms - (num_events - 1) * kResendDelay *
         kTimeBetweenEventsMs);
     for (int i = 0; i < num_events; i++) {
-      p.AddReceiverEventLog(0, FRAME_ACK_SENT,
-        i * kResendDelay * kTimeBetweenEventsMs);
+      p.AddReceiverEventLog(
+          0, FRAME_ACK_SENT,
+          base::checked_cast<uint16>(i * kResendDelay * kTimeBetweenEventsMs));
     }
 
     FrameEvent frame_event;