Oilpan: have Navigator and its supplements be on the heap by default.

Source/modules/webmidi/NavigatorWebMIDI.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 23 matching lines @@
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/frame/DOMWindowProperty.h"
 #include "modules/webmidi/MIDIOptions.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Navigator;
 
-class NavigatorWebMIDI final : public NoBaseWillBeGarbageCollected<NavigatorWebMIDI>, public WillBeHeapSupplement<Navigator>, public DOMWindowProperty {
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NavigatorWebMIDI);
-    DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(NavigatorWebMIDI);
+class NavigatorWebMIDI final : public GarbageCollectedFinalized<NavigatorWebMIDI>, public HeapSupplement<Navigator>, public DOMWindowProperty {
+    USING_GARBAGE_COLLECTED_MIXIN(NavigatorWebMIDI);
 public:
     static NavigatorWebMIDI& from(Navigator&);
+    virtual ~NavigatorWebMIDI();
 
     static ScriptPromise requestMIDIAccess(ScriptState*, Navigator&, const MIDIOptions&);
     ScriptPromise requestMIDIAccess(ScriptState*, const MIDIOptions&);
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
-    NavigatorWebMIDI(LocalFrame*);
+    explicit NavigatorWebMIDI(LocalFrame*);
     static const char* supplementName();
 };
 
 } // namespace blink
 
 #endif // NavigatorWebMIDI_h