Make WebMIDI use blink Promise.

Source/modules/webmidi/NavigatorWebMIDI.h

Index: Source/modules/webmidi/NavigatorWebMIDI.h
diff --git a/Source/modules/webmidi/NavigatorWebMIDI.h b/Source/modules/webmidi/NavigatorWebMIDI.h
index 1b6e73bc191e3f42a7251e55eeb4f67b4341c3e9..6941f6a54496e234ca54e01c94da2cfd9fcd15cc 100644
--- a/Source/modules/webmidi/NavigatorWebMIDI.h
+++ b/Source/modules/webmidi/NavigatorWebMIDI.h
@@ -31,26 +31,36 @@
 #ifndef NavigatorWebMIDI_h
 #define NavigatorWebMIDI_h
 
+#include "bindings/v8/ScriptPromise.h"
 #include "core/frame/DOMWindowProperty.h"
 #include "modules/webmidi/MIDIOptions.h"
 #include "platform/Supplementable.h"
+#include "wtf/HashSet.h"
+#include "wtf/RefPtr.h"
 
 namespace WebCore {
 
-class MIDIAccessPromise;
+class ExecutionContext;
+class Frame;
 class Navigator;
+class MIDIAccess;
 
 class NavigatorWebMIDI : public Supplement<Navigator>, public DOMWindowProperty {
 public:
     virtual ~NavigatorWebMIDI();
     static NavigatorWebMIDI* from(Navigator*);
 
-    static PassRefPtr<MIDIAccessPromise> requestMIDIAccess(Navigator*, const Dictionary&);
-    PassRefPtr<MIDIAccessPromise> requestMIDIAccess(const Dictionary&);
+    static ScriptPromise requestMIDIAccess(Navigator*, const Dictionary&);
+    ScriptPromise requestMIDIAccess(const Dictionary&);
+
+    void registerPending(MIDIAccess*);
+    void unregisterPending(MIDIAccess*);
 
 private:
+    void clearPending();
     NavigatorWebMIDI(Frame*);
     static const char* supplementName();
+    HashSet<RefPtr<MIDIAccess> > m_pending;
 };
 
 } // namespace WebCore