ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp

 /*
  * Copyright (C) 2013 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 346 matching lines @@
     WebEncryptedMediaSessionType sessionType) {
   MediaKeySession* session =
       new MediaKeySession(scriptState, mediaKeys, sessionType);
   session->suspendIfNeeded();
   return session;
 }
 
 MediaKeySession::MediaKeySession(ScriptState* scriptState,
                                  MediaKeys* mediaKeys,
                                  WebEncryptedMediaSessionType sessionType)
-    : ActiveScriptWrappable(this),
+    : ActiveScriptWrappable<MediaKeySession>(this),
       SuspendableObject(scriptState->getExecutionContext()),
       m_asyncEventQueue(GenericEventQueue::create(this)),
       m_mediaKeys(mediaKeys),
       m_sessionType(sessionType),
       m_expiration(std::numeric_limits<double>::quiet_NaN()),
       m_keyStatusesMap(new MediaKeyStatusMap()),
       m_isUninitialized(true),
       m_isCallable(false),
       m_isClosed(false),
       m_closedPromise(new ClosedPromise(scriptState->getExecutionContext(),
@@ skipping 666 matching lines @@
   visitor->trace(m_asyncEventQueue);
   visitor->trace(m_pendingActions);
   visitor->trace(m_mediaKeys);
   visitor->trace(m_keyStatusesMap);
   visitor->trace(m_closedPromise);
   EventTargetWithInlineData::trace(visitor);
   SuspendableObject::trace(visitor);
 }
 
 }  // namespace blink