When HLS redirects are encountered recreate WebMediaPlayer.

media/blink/webmediaplayer_impl.h

Index: media/blink/webmediaplayer_impl.h
diff --git a/media/blink/webmediaplayer_impl.h b/media/blink/webmediaplayer_impl.h
index 9a127640bbf5fa8b6c1d4909d4c6ea2b7a5c724b..5a6f3b489c537f47869c8d7a02b2c882434801eb 100644
--- a/media/blink/webmediaplayer_impl.h
+++ b/media/blink/webmediaplayer_impl.h
@@ -223,6 +223,8 @@ class MEDIA_BLINK_EXPORT WebMediaPlayerImpl
     bool is_suspended;
   };
 
+  blink::WebURL alternativeSourceURL() const override;
+
  private:
   friend class WebMediaPlayerImplTest;
 
@@ -512,6 +514,8 @@ class MEDIA_BLINK_EXPORT WebMediaPlayerImpl
   // state as part of the call to OnHidden().
   base::OneShotTimer background_pause_timer_;
 
+  GURL alternative_source_url_;
+
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };