Unset CompositorWorkerGlobalScope during WorkerGlobalScope::dipose.

third_party/WebKit/Source/modules/compositorworker/CompositorWorkerGlobalScope.h

 // 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.
 
 #ifndef CompositorWorkerGlobalScope_h
 #define CompositorWorkerGlobalScope_h
 
 #include "core/dom/CompositorProxyClient.h"
 #include "core/dom/FrameRequestCallbackCollection.h"
 #include "core/dom/MessagePort.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "modules/ModulesExport.h"
 #include <memory>
 
 namespace blink {
 
 class CompositorWorkerThread;
 class WorkerThreadStartupData;
 
 class MODULES_EXPORT CompositorWorkerGlobalScope final : public WorkerGlobalScope {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static CompositorWorkerGlobalScope* create(CompositorWorkerThread*, std::unique_ptr<WorkerThreadStartupData>, double timeOrigin);
     ~CompositorWorkerGlobalScope() override;
 
     // EventTarget
     const AtomicString& interfaceName() const override;
+    void removeAllEventListeners() override;
 
     void postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue>, const MessagePortArray&, ExceptionState&);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
 
     int requestAnimationFrame(FrameRequestCallback*);
     void cancelAnimationFrame(int id);
     bool executeAnimationFrameCallbacks(double highResTimeMs);
 
     // ExecutionContext:
     bool isCompositorWorkerGlobalScope() const override { return true; }
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     CompositorWorkerGlobalScope(const KURL&, const String& userAgent, CompositorWorkerThread*, double timeOrigin, std::unique_ptr<SecurityOrigin::PrivilegeData>, WorkerClients*);
     CompositorWorkerThread* thread() const;
 
     bool m_executingAnimationFrameCallbacks;
     FrameRequestCallbackCollection m_callbackCollection;
 };
 
 } // namespace blink
 
 #endif // CompositorWorkerGlobalScope_h