Remove SourceBuffer media tracks on detach from media element

third_party/WebKit/Source/modules/mediasource/SourceBuffer.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 116 matching lines @@
     void appendBufferAsyncPart();
     void appendError(bool decodeError);
 
     void removeAsyncPart();
 
     void appendStreamInternal(Stream*, ExceptionState&);
     void appendStreamAsyncPart();
     void appendStreamDone(bool success);
     void clearAppendStreamState();
 
+    void removeMediaTracks();
+
     // FileReaderLoaderClient interface
     void didStartLoading() override;
     void didReceiveDataForClient(const char* data, unsigned dataLength) override;
     void didFinishLoading() override;
     void didFail(FileError::ErrorCode) override;
 
     OwnPtr<WebSourceBuffer> m_webSourceBuffer;
     Member<MediaSource> m_source;
     Member<TrackDefaultList> m_trackDefaults;
     Member<GenericEventQueue> m_asyncEventQueue;
@@ skipping 18 matching lines @@
     bool m_streamMaxSizeValid;
     unsigned long long m_streamMaxSize;
     Member<AsyncMethodRunner<SourceBuffer>> m_appendStreamAsyncPartRunner;
     Member<Stream> m_stream;
     OwnPtr<FileReaderLoader> m_loader;
 };
 
 } // namespace blink
 
 #endif // SourceBuffer_h