Make V4L2CaptureDelegate non-ref-counted

media/capture/video/linux/v4l2_capture_delegate.h

Index: media/capture/video/linux/v4l2_capture_delegate.h
diff --git a/media/capture/video/linux/v4l2_capture_delegate.h b/media/capture/video/linux/v4l2_capture_delegate.h
index 82896bbcf0ac6e5ee42b9f318bc564a633673567..565ecac43d0c76b4b06aef33831d0f829f6dc1c8 100644
--- a/media/capture/video/linux/v4l2_capture_delegate.h
+++ b/media/capture/video/linux/v4l2_capture_delegate.h
@@ -10,7 +10,6 @@
 
 #include "base/files/scoped_file.h"
 #include "base/macros.h"
-#include "base/memory/ref_counted.h"
 #include "build/build_config.h"
 #include "media/capture/video/video_capture_device.h"
 
@@ -29,9 +28,7 @@ namespace media {
 // Class doing the actual Linux capture using V4L2 API. V4L2 SPLANE/MPLANE
 // capture specifics are implemented in derived classes. Created and destroyed
 // on the owner's thread, otherwise living and operating on |v4l2_task_runner_|.
-// TODO(mcasas): Make this class a non-ref-counted.
-class CAPTURE_EXPORT V4L2CaptureDelegate final
-    : public base::RefCountedThreadSafe<V4L2CaptureDelegate> {
+class CAPTURE_EXPORT V4L2CaptureDelegate final {
  public:
   // Retrieves the #planes for a given |fourcc|, or 0 if unknown.
   static size_t GetNumPlanesForFourCc(uint32_t fourcc);
@@ -47,6 +44,7 @@ class CAPTURE_EXPORT V4L2CaptureDelegate final
       const VideoCaptureDeviceDescriptor& device_descriptor,
       const scoped_refptr<base::SingleThreadTaskRunner>& v4l2_task_runner,
       int power_line_frequency);
+  ~V4L2CaptureDelegate();
 
   // Forward-to versions of VideoCaptureDevice virtual methods.
   void AllocateAndStart(int width,
@@ -67,9 +65,6 @@ class CAPTURE_EXPORT V4L2CaptureDelegate final
  private:
   friend class V4L2CaptureDelegateTest;
 
-  friend class base::RefCountedThreadSafe<V4L2CaptureDelegate>;
-  ~V4L2CaptureDelegate();
-
   class BufferTracker;
 
   // VIDIOC_QUERYBUFs a buffer from V4L2, creates a BufferTracker for it and