HeapSupplements are now just Supplements.

third_party/WebKit/Source/modules/mediasession/HTMLMediaElementMediaSession.cpp

 // 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.
 
 #include "modules/mediasession/HTMLMediaElementMediaSession.h"
 
 #include "core/dom/ExceptionCode.h"
 
 namespace blink {
 
@@ skipping 25 matching lines @@
     HTMLMediaElementMediaSession* supplement = fromIfExists(element);
     if (!supplement) {
         supplement = new HTMLMediaElementMediaSession();
         provideTo(element, supplementName(), supplement);
     }
     return *supplement;
 }
 
 HTMLMediaElementMediaSession* HTMLMediaElementMediaSession::fromIfExists(HTMLMediaElement& element)
 {
-    return static_cast<HTMLMediaElementMediaSession*>(HeapSupplement<HTMLMediaElement>::from(element, supplementName()));
+    return static_cast<HTMLMediaElementMediaSession*>(Supplement<HTMLMediaElement>::from(element, supplementName()));
 }
 
 DEFINE_TRACE(HTMLMediaElementMediaSession)
 {
     visitor->trace(m_session);
-    HeapSupplement<HTMLMediaElement>::trace(visitor);
+    Supplement<HTMLMediaElement>::trace(visitor);
 }
 
 } // namespace blink