Revert of Use timer task queue for RenderMediaLog

content/renderer/media/render_media_log.h

Index: content/renderer/media/render_media_log.h
diff --git a/content/renderer/media/render_media_log.h b/content/renderer/media/render_media_log.h
index 568e283579dfb2575eebd185518edf7dd5569bd0..ed9ce629889c0b1d2c5eb53eb77f4db4d4fdcf8a 100644
--- a/content/renderer/media/render_media_log.h
+++ b/content/renderer/media/render_media_log.h
@@ -33,9 +33,7 @@
 // It must be constructed on the render thread.
 class CONTENT_EXPORT RenderMediaLog : public media::MediaLog {
  public:
-  explicit RenderMediaLog(
-      const GURL& security_origin,
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+  explicit RenderMediaLog(const GURL& security_origin);
 
   // MediaLog implementation.
   void AddEvent(std::unique_ptr<media::MediaLogEvent> event) override;