[part 2] Make classes and structures in modules fast-allocated.

Source/modules/webmidi/MIDIController.h

Index: Source/modules/webmidi/MIDIController.h
diff --git a/Source/modules/webmidi/MIDIController.h b/Source/modules/webmidi/MIDIController.h
index bc66bbe412e41d7a3fd82d7059790d98e93071b1..ee81f8e8b443f9b536ca20ee473a66f35294ab22 100644
--- a/Source/modules/webmidi/MIDIController.h
+++ b/Source/modules/webmidi/MIDIController.h
@@ -41,6 +41,7 @@ class MIDIClient;
 
 class MIDIController final : public NoBaseWillBeGarbageCollectedFinalized<MIDIController>, public WillBeHeapSupplement<LocalFrame> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MIDIController);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(MIDIController);
 public:
     virtual ~MIDIController();