Initialize the rtp_stream_id field added by https://codereview.chromium.org/2307653002/.

media/cast/net/cast_transport_config.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/cast/net/cast_transport_config.h"
 
 namespace media {
 namespace cast {
 
 CastTransportRtpConfig::CastTransportRtpConfig()
-    : ssrc(0), feedback_ssrc(0), rtp_payload_type(RtpPayloadType::UNKNOWN) {}
+    : rtp_stream_id(0),
+      ssrc(0),
+      feedback_ssrc(0),
+      rtp_payload_type(RtpPayloadType::UNKNOWN) {}
 
 CastTransportRtpConfig::~CastTransportRtpConfig() {}
 
 EncodedFrame::EncodedFrame()
     : dependency(UNKNOWN_DEPENDENCY),
       new_playout_delay_ms(0) {}
 
 EncodedFrame::~EncodedFrame() {}
 
 void EncodedFrame::CopyMetadataTo(EncodedFrame* dest) const {
@@ skipping 23 matching lines @@
       last_sr(0),
       delay_since_last_sr(0) {}
 RtcpReportBlock::~RtcpReportBlock() {}
 
 RtcpDlrrReportBlock::RtcpDlrrReportBlock()
     : last_rr(0), delay_since_last_rr(0) {}
 RtcpDlrrReportBlock::~RtcpDlrrReportBlock() {}
 
 }  // namespace cast
 }  // namespace media