Video Player: Hide the cast icon on non-drive volume

ui/file_manager/video_player/css/header.css

Index: ui/file_manager/video_player/css/header.css
diff --git a/ui/file_manager/video_player/css/header.css b/ui/file_manager/video_player/css/header.css
index fa37d554c901a962e94ec24b1b8c964e42e8a240..35868372fc8d71154a47bf041c46aa6fc2d71b80 100644
--- a/ui/file_manager/video_player/css/header.css
+++ b/ui/file_manager/video_player/css/header.css
@@ -81,10 +81,14 @@
       url(../images/200/cast_on.png) 2x);
 }
 
-#video-player > .header > button.cast-button.hidden {
+#video-player > .header > button.cast-button {
   display: none;
 }
 
+#video-player[cast-available][castable] > .header > button.cast-button {
+  display: block;
+}
+
 #video-player > .header > button.minimize-button {
   background-image: -webkit-image-set(
       url(chrome://resources/images/apps/topbar_button_minimize.png) 1x,