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 11b7f6984d40c9b520c36f6e92b58a8975d8d582..e7bfb1592fa9f4e34a2129b08498c62729764ba5 100644
--- a/Source/modules/webmidi/NavigatorWebMIDI.h
+++ b/Source/modules/webmidi/NavigatorWebMIDI.h
@@ -31,13 +31,14 @@
 #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"
 
 namespace WebCore {
 
-class MIDIAccessPromise;
+class ExecutionContext;
 class Navigator;
 
 class NavigatorWebMIDI FINAL : public Supplement<Navigator>, public DOMWindowProperty {
@@ -45,8 +46,8 @@ public:
     virtual ~NavigatorWebMIDI();
     static NavigatorWebMIDI& from(Navigator&);
 
-    static PassRefPtrWillBeRawPtr<MIDIAccessPromise> requestMIDIAccess(Navigator&, const Dictionary&);
-    PassRefPtrWillBeRawPtr<MIDIAccessPromise> requestMIDIAccess(const Dictionary&);
+    static ScriptPromise requestMIDIAccess(Navigator&, const Dictionary&);
+    ScriptPromise requestMIDIAccess(const Dictionary&);
 
 private:
     NavigatorWebMIDI(LocalFrame*);