Remove custom left overs from object grouping

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

Index: third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h
diff --git a/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h b/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h
index 58f18ee304c4d8524780ffd958297222f4bfcf90..318faa232f773c385ebdd36b988bf441c0492047 100644
--- a/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h
+++ b/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h
@@ -89,12 +89,6 @@ class MODULES_EXPORT RemotePlayback final
   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>>