ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/modules/webmidi/MIDIAccess.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 46 matching lines @@
   return state;
 }
 
 }  // namespace
 
 MIDIAccess::MIDIAccess(
     std::unique_ptr<MIDIAccessor> accessor,
     bool sysexEnabled,
     const Vector<MIDIAccessInitializer::PortDescriptor>& ports,
     ExecutionContext* executionContext)
-    : ActiveScriptWrappable(this),
+    : ActiveScriptWrappable<MIDIAccess>(this),
       SuspendableObject(executionContext),
       m_accessor(std::move(accessor)),
       m_sysexEnabled(sysexEnabled),
       m_hasPendingActivity(false) {
   m_accessor->setClient(this);
   for (size_t i = 0; i < ports.size(); ++i) {
     const MIDIAccessInitializer::PortDescriptor& port = ports[i];
     if (port.type == MIDIPort::TypeInput) {
       m_inputs.append(MIDIInput::create(this, port.id, port.manufacturer,
                                         port.name, port.version,
@@ skipping 153 matching lines @@
 }
 
 DEFINE_TRACE(MIDIAccess) {
   visitor->trace(m_inputs);
   visitor->trace(m_outputs);
   EventTargetWithInlineData::trace(visitor);
   SuspendableObject::trace(visitor);
 }
 
 }  // namespace blink