[Mojo Video Capture] Implement a VideoCaptureProvider using the Mojo service (part 2)

content/browser/renderer_host/media/service_launched_video_capture_device.h

 // Copyright 2017 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_BROWSER_RENDERER_HOST_MEDIA_SERVICE_LAUNCHED_VIDEO_CAPTURE_DEVICE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_SERVICE_LAUNCHED_VIDEO_CAPTURE_DEVICE_H_
 
 #include "content/browser/renderer_host/media/video_capture_provider.h"
 #include "services/video_capture/public/interfaces/device.mojom.h"
 
@@ skipping 19 matching lines @@
   void MaybeSuspendDevice() override;
   void ResumeDevice() override;
   void RequestRefreshFrame() override;
 
   void SetDesktopCaptureWindowIdAsync(gfx::NativeViewId window_id,
                                       base::OnceClosure done_cb) override;
 
   void OnUtilizationReport(int frame_feedback_id, double utilization) override;
 
  private:
-  const video_capture::mojom::DevicePtr device_;
+  void OnLostConnectionToDevice();
+
+  video_capture::mojom::DevicePtr device_;
+  base::SequenceChecker sequence_checker_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_SERVICE_LAUNCHED_VIDEO_CAPTURE_DEVICE_H_