HeapSupplements are now just Supplements.

third_party/WebKit/Source/modules/webmidi/NavigatorWebMIDI.cpp

 /*
  * 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 35 matching lines @@
     : DOMWindowProperty(frame)
 {
 }
 
 NavigatorWebMIDI::~NavigatorWebMIDI()
 {
 }
 
 DEFINE_TRACE(NavigatorWebMIDI)
 {
-    HeapSupplement<Navigator>::trace(visitor);
+    Supplement<Navigator>::trace(visitor);
     DOMWindowProperty::trace(visitor);
 }
 
 const char* NavigatorWebMIDI::supplementName()
 {
     return "NavigatorWebMIDI";
 }
 
 NavigatorWebMIDI& NavigatorWebMIDI::from(Navigator& navigator)
 {
-    NavigatorWebMIDI* supplement = static_cast<NavigatorWebMIDI*>(HeapSupplement<Navigator>::from(navigator, supplementName()));
+    NavigatorWebMIDI* supplement = static_cast<NavigatorWebMIDI*>(Supplement<Navigator>::from(navigator, supplementName()));
     if (!supplement) {
         supplement = new NavigatorWebMIDI(navigator.frame());
         provideTo(navigator, supplementName(), supplement);
     }
     return *supplement;
 }
 
 ScriptPromise NavigatorWebMIDI::requestMIDIAccess(ScriptState* scriptState, Navigator& navigator, const MIDIOptions& options)
 {
     return NavigatorWebMIDI::from(navigator).requestMIDIAccess(scriptState, options);
 }
 
 ScriptPromise NavigatorWebMIDI::requestMIDIAccess(ScriptState* scriptState, const MIDIOptions& options)
 {
     if (!frame() || frame()->document()->activeDOMObjectsAreStopped()) {
         return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(AbortError, "The frame is not working."));
     }
 
     UseCounter::countCrossOriginIframe(*frame()->document(), UseCounter::RequestMIDIAccessIframe);
     return MIDIAccessInitializer::start(scriptState, options);
 }
 
 } // namespace blink