Use StreamParser::TrackId instead of string for MediaTrack::byteStreamTrackId

media/blink/websourcebuffer_impl.cc

Index: media/blink/websourcebuffer_impl.cc
diff --git a/media/blink/websourcebuffer_impl.cc b/media/blink/websourcebuffer_impl.cc
index e4aa84df39ef90a7e56540b1ff5e47a404105d10..5fa35e7e4228318327c7e8600b8a406177039177 100644
--- a/media/blink/websourcebuffer_impl.cc
+++ b/media/blink/websourcebuffer_impl.cc
@@ -12,6 +12,7 @@
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
+#include "base/strings/string_number_conversions.h"
 #include "media/base/media_tracks.h"
 #include "media/base/timestamp_constants.h"
 #include "media/filters/chunk_demuxer.h"
@@ -181,7 +182,8 @@ void WebSourceBufferImpl::InitSegmentReceived(scoped_ptr<MediaTracks> tracks) {
   for (const auto& track : tracks->tracks()) {
     blink::WebSourceBufferClient::MediaTrackInfo trackInfo;
     trackInfo.trackType = mediaTrackTypeToBlink(track->type());
-    trackInfo.byteStreamTrackId = blink::WebString::fromUTF8(track->id());
+    trackInfo.byteStreamTrackId =
+        blink::WebString::fromUTF8(base::UintToString(track->id()));
     trackInfo.kind = blink::WebString::fromUTF8(track->kind());
     trackInfo.label = blink::WebString::fromUTF8(track->label());
     trackInfo.language = blink::WebString::fromUTF8(track->language());