HeapSupplements are now just Supplements.

third_party/WebKit/Source/modules/remoteplayback/HTMLMediaElementRemotePlayback.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 HTMLMediaElementRemotePlayback_h
 #define HTMLMediaElementRemotePlayback_h
 
 #include "modules/ModulesExport.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class HTMLMediaElement;
 class QualifiedName;
 class RemotePlayback;
 
 // Class used to implement the Remote Playback API. It is a supplement to
 // HTMLMediaElement.
-class HTMLMediaElementRemotePlayback final : public GarbageCollected<HTMLMediaElementRemotePlayback>, public HeapSupplement<HTMLMediaElement> {
+class HTMLMediaElementRemotePlayback final : public GarbageCollected<HTMLMediaElementRemotePlayback>, public Supplement<HTMLMediaElement> {
     USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElementRemotePlayback);
 public:
     static bool fastHasAttribute(const QualifiedName&, const HTMLMediaElement&);
     static void setBooleanAttribute(const QualifiedName&, HTMLMediaElement&, bool);
 
     static HTMLMediaElementRemotePlayback& from(HTMLMediaElement&);
     static RemotePlayback* remote(HTMLMediaElement&);
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     static const char* supplementName();
 
     Member<RemotePlayback> m_remote;
 };
 
 } // namespace blink
 
 #endif // HTMLMediaElementRemotePlayback_h