Remove DeviceLightEvent implementation

content/renderer/device_sensors/device_light_event_pump.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 CONTENT_RENDERER_DEVICE_SENSORS_DEVICE_LIGHT_EVENT_PUMP_H_
-#define CONTENT_RENDERER_DEVICE_SENSORS_DEVICE_LIGHT_EVENT_PUMP_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "content/renderer/device_sensors/device_sensor_event_pump.h"
-#include "content/renderer/shared_memory_seqlock_reader.h"
-#include "device/sensors/public/cpp/device_light_data.h"
-#include "device/sensors/public/interfaces/light.mojom.h"
-
-namespace blink {
-class WebDeviceLightListener;
-}
-
-namespace content {
-
-typedef SharedMemorySeqLockReader<device::DeviceLightData>
-    DeviceLightSharedMemoryReader;
-
-class CONTENT_EXPORT DeviceLightEventPump
-    : public DeviceSensorMojoClientMixin<
-          DeviceSensorEventPump<blink::WebDeviceLightListener>,
-          device::mojom::LightSensor> {
- public:
-  explicit DeviceLightEventPump(RenderThread* thread);
-  ~DeviceLightEventPump() override;
-
-  // Sets the listener to receive updates for device light data at
-  // regular intervals. Returns true if the registration was successful.
-  bool SetListener(blink::WebDeviceLightListener* listener);
-
-  // PlatformEventObserver implementation.
-  void SendFakeDataForTesting(void* data) override;
-
- protected:
-  // Methods overriden from base class DeviceSensorEventPump
-  void FireEvent() override;
-  bool InitializeReader(base::SharedMemoryHandle handle) override;
-
- private:
-  bool ShouldFireEvent(double data) const;
-
-  std::unique_ptr<DeviceLightSharedMemoryReader> reader_;
-  double last_seen_data_;
-
-  DISALLOW_COPY_AND_ASSIGN(DeviceLightEventPump);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_DEVICE_SENSORS_DEVICE_LIGHT_EVENT_PUMP_H_