ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/modules/mediarecorder/MediaRecorder.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/mediarecorder/MediaRecorder.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "core/events/Event.h"
 #include "core/fileapi/Blob.h"
 #include "core/inspector/ConsoleMessage.h"
@@ skipping 142 matching lines @@
       new MediaRecorder(context, stream, options, exceptionState);
   recorder->suspendIfNeeded();
 
   return recorder;
 }
 
 MediaRecorder::MediaRecorder(ExecutionContext* context,
                              MediaStream* stream,
                              const MediaRecorderOptions& options,
                              ExceptionState& exceptionState)
-    : ActiveScriptWrappable(this),
+    : ActiveScriptWrappable<MediaRecorder>(this),
       SuspendableObject(context),
       m_stream(stream),
       m_streamAmountOfTracks(stream->getTracks().size()),
       m_mimeType(options.hasMimeType() ? options.mimeType() : kDefaultMimeType),
       m_stopped(true),
       m_ignoreMutedMedia(true),
       m_audioBitsPerSecond(0),
       m_videoBitsPerSecond(0),
       m_state(State::Inactive),
       m_dispatchScheduledEventRunner(AsyncMethodRunner<MediaRecorder>::create(
@@ skipping 219 matching lines @@
 
 DEFINE_TRACE(MediaRecorder) {
   visitor->trace(m_stream);
   visitor->trace(m_dispatchScheduledEventRunner);
   visitor->trace(m_scheduledEvents);
   EventTargetWithInlineData::trace(visitor);
   SuspendableObject::trace(visitor);
 }
 
 }  // namespace blink