Supplement should have a Member to the corresponding Supplementable object

third_party/WebKit/Source/modules/plugins/NavigatorPlugins.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NavigatorPlugins_h
 #define NavigatorPlugins_h
 
 #include "core/dom/ContextLifecycleObserver.h"
+#include "core/frame/Navigator.h"
 #include "platform/Supplementable.h"
 
 namespace blink {
 
 class DOMMimeTypeArray;
 class DOMPluginArray;
 class LocalFrame;
 class Navigator;
 
 class NavigatorPlugins final : public GarbageCollected<NavigatorPlugins>,
@@ skipping 19 matching lines @@
   DOMPluginArray* plugins(LocalFrame*) const;
   DOMMimeTypeArray* mimeTypes(LocalFrame*) const;
 
   mutable Member<DOMPluginArray> m_plugins;
   mutable Member<DOMMimeTypeArray> m_mimeTypes;
 };
 
 }  // namespace blink
 
 #endif  // NavigatorPlugins_h