Remove DeviceLightEvent implementation

third_party/WebKit/Source/modules/device_light/DeviceLightController.h

-// Copyright 2014 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 DeviceLightController_h
-#define DeviceLightController_h
-
-#include "core/dom/Document.h"
-#include "core/frame/DeviceSingleWindowEventController.h"
-#include "modules/ModulesExport.h"
-
-namespace blink {
-
-class Event;
-
-class MODULES_EXPORT DeviceLightController final
-    : public DeviceSingleWindowEventController,
-      public Supplement<Document> {
-  USING_GARBAGE_COLLECTED_MIXIN(DeviceLightController);
-
- public:
-  ~DeviceLightController() override;
-
-  static const char* SupplementName();
-  static DeviceLightController& From(Document&);
-
-  DECLARE_VIRTUAL_TRACE();
-
- private:
-  explicit DeviceLightController(Document&);
-
-  // Inherited from DeviceEventControllerBase.
-  void RegisterWithDispatcher() override;
-  void UnregisterWithDispatcher() override;
-  bool HasLastData() override;
-
-  // Inherited from DeviceSingleWindowEventController.
-  Event* LastEvent() const override;
-  const AtomicString& EventTypeName() const override;
-  bool IsNullEvent(Event*) const override;
-};
-
-}  // namespace blink
-
-#endif  // DeviceLightController_h