ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/modules/indexeddb/IDBDatabase.h

 /*
  * Copyright (C) 2010 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:
  *
  * 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
@@ skipping 37 matching lines @@
 #include <memory>
 
 namespace blink {
 
 class DOMException;
 class ExceptionState;
 class ExecutionContext;
 class IDBObserver;
 struct WebIDBObservation;
 
-class MODULES_EXPORT IDBDatabase final : public EventTargetWithInlineData,
-                                         public ActiveScriptWrappable,
-                                         public SuspendableObject {
+class MODULES_EXPORT IDBDatabase final
+    : public EventTargetWithInlineData,
+      public ActiveScriptWrappable<IDBDatabase>,
+      public SuspendableObject {
   USING_GARBAGE_COLLECTED_MIXIN(IDBDatabase);
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static IDBDatabase* create(ExecutionContext*,
                              std::unique_ptr<WebIDBDatabase>,
                              IDBDatabaseCallbacks*);
   ~IDBDatabase() override;
   DECLARE_VIRTUAL_TRACE();
 
@@ skipping 123 matching lines @@
   // Keep track of the versionchange events waiting to be fired on this
   // database so that we can cancel them if the database closes.
   HeapVector<Member<Event>> m_enqueuedEvents;
 
   Member<IDBDatabaseCallbacks> m_databaseCallbacks;
 };
 
 }  // namespace blink
 
 #endif  // IDBDatabase_h