Web MIDI: implement MIDISuccessCallback and MIDIOptions

Source/modules/webmidi/MIDIErrorCallback.h

Index: Source/modules/webmidi/MIDIErrorCallback.h
diff --git a/Source/modules/webmidi/MIDIErrorCallback.h b/Source/modules/webmidi/MIDIErrorCallback.h
index 3a0e41edbee99b7c447866ce544afa475c131c10..2684f7bd58b9d03d854c4da09a60386f00039cd7 100644
--- a/Source/modules/webmidi/MIDIErrorCallback.h
+++ b/Source/modules/webmidi/MIDIErrorCallback.h
@@ -31,21 +31,16 @@
 #ifndef MIDIErrorCallback_h
 #define MIDIErrorCallback_h
 
-#include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class DOMError;
-class ScriptExecutionContext;
 
 class MIDIErrorCallback : public RefCounted<MIDIErrorCallback> {
 public:
     virtual ~MIDIErrorCallback() { }
     virtual bool handleEvent(DOMError*) = 0;
-
-    // Helper to post callback task.
-    void scheduleCallback(ScriptExecutionContext*, PassRefPtr<DOMError>);
 };
 
 } // namespace WebCore