content/child: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

content/renderer/media/mock_media_stream_video_source.cc

Index: content/renderer/media/mock_media_stream_video_source.cc
diff --git a/content/renderer/media/mock_media_stream_video_source.cc b/content/renderer/media/mock_media_stream_video_source.cc
index cf9f6856e21399499d65d89846766776d28e62f4..bd32430e95d4fc98a0e9a23070e7420bdb190226 100644
--- a/content/renderer/media/mock_media_stream_video_source.cc
+++ b/content/renderer/media/mock_media_stream_video_source.cc
@@ -77,9 +77,8 @@ void MockMediaStreamVideoSource::StopSourceImpl() {
 void MockMediaStreamVideoSource::DeliverVideoFrame(
     const scoped_refptr<media::VideoFrame>& frame) {
   DCHECK(!frame_callback_.is_null());
-  io_message_loop()->PostTask(
-      FROM_HERE,
-      base::Bind(frame_callback_, frame, base::TimeTicks()));
+  io_task_runner()->PostTask(
+      FROM_HERE, base::Bind(frame_callback_, frame, base::TimeTicks()));
 }
 
 }  // namespace content