[Blink>MediaSession] Use setActionCallback() instead of event listeners for media control actions

content/browser/media/session/media_session_service_impl.cc

Index: content/browser/media/session/media_session_service_impl.cc
diff --git a/content/browser/media/session/media_session_service_impl.cc b/content/browser/media/session/media_session_service_impl.cc
index 1d93af395a1768bfd000c226d51b0d862230ebf8..7e92663355d4eb85175c94603ad72bb099feb913 100644
--- a/content/browser/media/session/media_session_service_impl.cc
+++ b/content/browser/media/session/media_session_service_impl.cc
@@ -68,6 +68,10 @@ void MediaSessionServiceImpl::SetMetadata(
 
 void MediaSessionServiceImpl::EnableAction(
     blink::mojom::MediaSessionAction action) {
+  // Action already enabled
+  if (actions_.find(action) != actions_.end())
+    return;
+
   actions_.insert(action);
   MediaSessionImpl* session = GetMediaSession();
   if (session)
@@ -76,6 +80,10 @@ void MediaSessionServiceImpl::EnableAction(
 
 void MediaSessionServiceImpl::DisableAction(
     blink::mojom::MediaSessionAction action) {
+  // Action already disabled
+  if (actions_.find(action) == actions_.end())
+    return;
+
   actions_.erase(action);
   MediaSessionImpl* session = GetMediaSession();
   if (session)