ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/core/streams/UnderlyingSourceBase.h

 // Copyright 2016 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.
 
 #ifndef UnderlyingSourceBase_h
 #define UnderlyingSourceBase_h
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/dom/SuspendableObject.h"
 #include "platform/heap/GarbageCollected.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class ReadableStreamController;
 
 class CORE_EXPORT UnderlyingSourceBase
     : public GarbageCollectedFinalized<UnderlyingSourceBase>,
       public ScriptWrappable,
-      public ActiveScriptWrappable,
+      public ActiveScriptWrappable<UnderlyingSourceBase>,
       public SuspendableObject {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(UnderlyingSourceBase);
 
  public:
   DECLARE_VIRTUAL_TRACE();
   virtual ~UnderlyingSourceBase() {}
 
   ScriptPromise startWrapper(ScriptState*, ScriptValue stream);
   virtual ScriptPromise start(ScriptState*);
 
   virtual ScriptPromise pull(ScriptState*);
 
   ScriptPromise cancelWrapper(ScriptState*, ScriptValue reason);
   virtual ScriptPromise cancel(ScriptState*, ScriptValue reason);
 
   void notifyLockAcquired();
   void notifyLockReleased();
 
   // ScriptWrappable
   bool hasPendingActivity() const;
 
   // SuspendableObject
   void contextDestroyed() override;
 
  protected:
   explicit UnderlyingSourceBase(ScriptState* scriptState)
-      : ActiveScriptWrappable(this),
+      : ActiveScriptWrappable<UnderlyingSourceBase>(this),
         SuspendableObject(scriptState->getExecutionContext()) {
     this->suspendIfNeeded();
   }
 
   ReadableStreamController* controller() const { return m_controller; }
 
  private:
   Member<ReadableStreamController> m_controller;
   bool m_isStreamLocked = false;
 };
 
 }  // namespace blink
 
 #endif  // UnderlyingSourceBase_h