Remove custom left overs from object grouping

third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h

 // Copyright 2016 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 RemotePlayback_h
 #define RemotePlayback_h
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/TraceWrapperMember.h"
@@ skipping 71 matching lines @@
   // Calls the specified availability callback with the current availability.
   // Need a void() method to post it as a task.
   void notifyInitialAvailability(int callbackId);
 
   // WebRemotePlaybackClient implementation.
   void stateChanged(WebRemotePlaybackState) override;
   void availabilityChanged(WebRemotePlaybackAvailability) override;
   void promptCancelled() override;
   bool remotePlaybackAvailable() const override;
 
-  // Prevent v8 from garbage collecting the availability callbacks.
-  // TODO(avayvod): remove when crbug.com/468240 is fixed and the references
-  // are maintained automatically.
-  void setV8ReferencesForCallbacks(v8::Isolate*,
-                                   const v8::Persistent<v8::Object>& wrapper);
-
   WebRemotePlaybackState m_state;
   WebRemotePlaybackAvailability m_availability;
   HeapHashMap<int, TraceWrapperMember<RemotePlaybackAvailabilityCallback>>
       m_availabilityCallbacks;
   Member<HTMLMediaElement> m_mediaElement;
   Member<ScriptPromiseResolver> m_promptPromiseResolver;
 };
 
 }  // namespace blink
 
 #endif  // RemotePlayback_h