[Mojo Video Capture] Do not instantiate in-process VideoCaptureSystem when using service

content/browser/renderer_host/media/in_process_video_capture_provider.h

Index: content/browser/renderer_host/media/in_process_video_capture_provider.h
diff --git a/content/browser/renderer_host/media/in_process_video_capture_provider.h b/content/browser/renderer_host/media/in_process_video_capture_provider.h
index 83603438f9751c3497b1e9e27e5b6b3630bae63b..33cb8543990f27577d61771bc70efc151bd9a168 100644
--- a/content/browser/renderer_host/media/in_process_video_capture_provider.h
+++ b/content/browser/renderer_host/media/in_process_video_capture_provider.h
@@ -19,21 +19,31 @@ class CONTENT_EXPORT InProcessVideoCaptureProvider
   InProcessVideoCaptureProvider(
       std::unique_ptr<media::VideoCaptureSystem> video_capture_system,
       scoped_refptr<base::SingleThreadTaskRunner> device_task_runner);
+
   ~InProcessVideoCaptureProvider() override;
 
+  static std::unique_ptr<VideoCaptureProvider>
+  CreateInstanceForNonDeviceCapture(
+      scoped_refptr<base::SingleThreadTaskRunner> device_task_runner);
+
+  static std::unique_ptr<VideoCaptureProvider> CreateInstance(
+      std::unique_ptr<media::VideoCaptureSystem> video_capture_system,
+      scoped_refptr<base::SingleThreadTaskRunner> device_task_runner);
+
   void Uninitialize() override;
 
   void GetDeviceInfosAsync(
-      const base::Callback<void(
-          const std::vector<media::VideoCaptureDeviceInfo>&)>& result_callback)
-      override;
+      const GetDeviceInfosCallback& result_callback) override;
 
   std::unique_ptr<VideoCaptureDeviceLauncher> CreateDeviceLauncher() override;
 
  private:
+  // Can be nullptr.
   const std::unique_ptr<media::VideoCaptureSystem> video_capture_system_;
   // The message loop of media stream device thread, where VCD's live.
-  scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
+  const scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
+
+  SEQUENCE_CHECKER(sequence_checker_);
 };
 
 }  // namespace content