Support to repeat one song in Audio Player.

ui/file_manager/audio_player/elements/control_panel.css

Index: ui/file_manager/audio_player/elements/control_panel.css
diff --git a/ui/file_manager/audio_player/elements/control_panel.css b/ui/file_manager/audio_player/elements/control_panel.css
index c4b60757f7978f86b9e1ffb1a8ea0daf71119252..9fb895aa6cb0b927ca2b856b593e8e48cb369a7e 100644
--- a/ui/file_manager/audio_player/elements/control_panel.css
+++ b/ui/file_manager/audio_player/elements/control_panel.css
@@ -143,13 +143,6 @@ paper-slider.disabled {
   margin-right: 0;
 }
 
-.media-button.repeat {
-  background-image: -webkit-image-set(
-      url(../assets/100/player_button_repeat.png) 1x,
-      url(../assets/200/player_button_repeat.png) 2x);
-  pointer-events: auto;
-}
-
 .media-button.play {
   margin-left: 4px;
   margin-right: 4px;