RemoteMediaPlayerManager: delete players on correct thread

chrome/browser/media/android/remote/remote_media_player_manager.cc

Index: chrome/browser/media/android/remote/remote_media_player_manager.cc
diff --git a/chrome/browser/media/android/remote/remote_media_player_manager.cc b/chrome/browser/media/android/remote/remote_media_player_manager.cc
index 301abde27b4fbbb73adbbb1482b93ea9b833c9a8..6b7efa91e8acfc45d9e5df1a6005d7301ca8babf 100644
--- a/chrome/browser/media/android/remote/remote_media_player_manager.cc
+++ b/chrome/browser/media/android/remote/remote_media_player_manager.cc
@@ -20,7 +20,12 @@ RemoteMediaPlayerManager::RemoteMediaPlayerManager(
       weak_ptr_factory_(this) {
 }
 
-RemoteMediaPlayerManager::~RemoteMediaPlayerManager() {}
+RemoteMediaPlayerManager::~RemoteMediaPlayerManager() {
+  for (MediaPlayerAndroid* player : alternative_players_)
+    player->DeleteOnCorrectThread();
+
+  alternative_players_.weak_clear();
+}
 
 void RemoteMediaPlayerManager::OnStart(int player_id) {
   RemoteMediaPlayerBridge* remote_player = GetRemotePlayer(player_id);