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

media/base/media_tracks.cc

Index: media/base/media_tracks.cc
diff --git a/media/base/media_tracks.cc b/media/base/media_tracks.cc
index 832e5a822b12a497f43d01aabc9ef898c55fb7d0..0388e1a6b3faf7e124500e8905ece44597b78595 100644
--- a/media/base/media_tracks.cc
+++ b/media/base/media_tracks.cc
@@ -15,7 +15,7 @@ MediaTracks::MediaTracks() {}
 MediaTracks::~MediaTracks() {}
 
 void MediaTracks::AddAudioTrack(const AudioDecoderConfig& config,
-                                const std::string& id,
+                                StreamParser::TrackId id,
                                 const std::string& kind,
                                 const std::string& label,
                                 const std::string& language) {
@@ -28,7 +28,7 @@ void MediaTracks::AddAudioTrack(const AudioDecoderConfig& config,
 }
 
 void MediaTracks::AddVideoTrack(const VideoDecoderConfig& config,
-                                const std::string& id,
+                                StreamParser::TrackId id,
                                 const std::string& kind,
                                 const std::string& label,
                                 const std::string& language) {
@@ -41,7 +41,7 @@ void MediaTracks::AddVideoTrack(const VideoDecoderConfig& config,
 }
 
 const AudioDecoderConfig& MediaTracks::getAudioConfig(
-    const std::string& id) const {
+    StreamParser::TrackId id) const {
   auto it = audio_configs_.find(id);
   if (it != audio_configs_.end())
     return it->second;
@@ -50,7 +50,7 @@ const AudioDecoderConfig& MediaTracks::getAudioConfig(
 }
 
 const VideoDecoderConfig& MediaTracks::getVideoConfig(
-    const std::string& id) const {
+    StreamParser::TrackId id) const {
   auto it = video_configs_.find(id);
   if (it != video_configs_.end())
     return it->second;