HeapSupplements are now just Supplements.

third_party/WebKit/Source/modules/storage/StorageNamespaceController.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/storage/StorageNamespaceController.h"
 
 #include "modules/storage/InspectorDOMStorageAgent.h"
 #include "modules/storage/StorageClient.h"
 #include "modules/storage/StorageNamespace.h"
 
 namespace blink {
 
 const char* StorageNamespaceController::supplementName()
 {
     return "StorageNamespaceController";
 }
 
 StorageNamespaceController::StorageNamespaceController(StorageClient* client)
     : m_client(client)
     , m_inspectorAgent(nullptr)
 {
 }
 
 StorageNamespaceController::~StorageNamespaceController()
 {
 }
 
 DEFINE_TRACE(StorageNamespaceController)
 {
-    HeapSupplement<Page>::trace(visitor);
+    Supplement<Page>::trace(visitor);
     visitor->trace(m_inspectorAgent);
 }
 
 StorageNamespace* StorageNamespaceController::sessionStorage(bool optionalCreate)
 {
     if (!m_sessionStorage && optionalCreate)
         m_sessionStorage = m_client->createSessionStorageNamespace();
     return m_sessionStorage.get();
 }
 
 void StorageNamespaceController::provideStorageNamespaceTo(Page& page, StorageClient* client)
 {
     StorageNamespaceController::provideTo(page, supplementName(), new StorageNamespaceController(client));
 }
 
 } // namespace blink