Web MIDI: final IDL updates to conform the latest WD for shipping

Source/modules/webmidi/MIDIOutput.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 27 matching lines @@
 
 class ExceptionState;
 class MIDIAccess;
 
 class MIDIOutput final : public MIDIPort {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static MIDIOutput* create(MIDIAccess*, unsigned portIndex, const String& id, const String& manufacturer, const String& name, const String& version, MIDIAccessor::MIDIPortState);
     ~MIDIOutput() override;
 
+    void clear();
     void send(DOMUint8Array*, double timestamp, ExceptionState&);
     void send(Vector<unsigned>, double timestamp, ExceptionState&);
 
     // send() without optional |timestamp|.
     void send(DOMUint8Array*, ExceptionState&);
     void send(Vector<unsigned>, ExceptionState&);
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     MIDIOutput(MIDIAccess*, unsigned portIndex, const String& id, const String& manufacturer, const String& name, const String& version, MIDIAccessor::MIDIPortState);
 
     unsigned m_portIndex;
 };
 
 } // namespace blink
 
 #endif // MIDIOutput_h