Remove calls to MessageLoop::current() in media.

media/capture/video/file_video_capture_device.cc

Index: media/capture/video/file_video_capture_device.cc
diff --git a/media/capture/video/file_video_capture_device.cc b/media/capture/video/file_video_capture_device.cc
index 9a40c50f4e8f4993d24455f294fbe2390ac1958c..10b3710f53fdf9775cda8682174c3ae5faf2aa84 100644
--- a/media/capture/video/file_video_capture_device.cc
+++ b/media/capture/video/file_video_capture_device.cc
@@ -332,7 +332,7 @@ void FileVideoCaptureDevice::StopAndDeAllocate() {
 void FileVideoCaptureDevice::OnAllocateAndStart(
     const VideoCaptureParams& params,
     std::unique_ptr<VideoCaptureDevice::Client> client) {
-  DCHECK_EQ(capture_thread_.message_loop(), base::MessageLoop::current());
+  DCHECK(capture_thread_.task_runner()->BelongsToCurrentThread());
 
   client_ = std::move(client);
 
@@ -352,14 +352,14 @@ void FileVideoCaptureDevice::OnAllocateAndStart(
 }
 
 void FileVideoCaptureDevice::OnStopAndDeAllocate() {
-  DCHECK_EQ(capture_thread_.message_loop(), base::MessageLoop::current());
+  DCHECK(capture_thread_.task_runner()->BelongsToCurrentThread());
   file_parser_.reset();
   client_.reset();
   next_frame_time_ = base::TimeTicks();
 }
 
 void FileVideoCaptureDevice::OnCaptureTask() {
-  DCHECK_EQ(capture_thread_.message_loop(), base::MessageLoop::current());
+  DCHECK(capture_thread_.task_runner()->BelongsToCurrentThread());
   if (!client_)
     return;