[Android] Stop all media on undoable close.

content/browser/media/android/browser_media_player_manager.cc

Index: content/browser/media/android/browser_media_player_manager.cc
diff --git a/content/browser/media/android/browser_media_player_manager.cc b/content/browser/media/android/browser_media_player_manager.cc
index c847a275b8f37d484775164dd90079ab69a135e7..79586842c96b625f0c9fb78924105b485625ec1c 100644
--- a/content/browser/media/android/browser_media_player_manager.cc
+++ b/content/browser/media/android/browser_media_player_manager.cc
@@ -265,6 +265,15 @@ void BrowserMediaPlayerManager::PauseVideo() {
   Send(new MediaPlayerMsg_PauseVideo(RoutingID()));
 }
 
+void BrowserMediaPlayerManager::ReleaseAllMediaPlayers() {
+  for (ScopedVector<MediaPlayerAndroid>::iterator it = players_.begin();
+      it != players_.end(); ++it) {
+    if ((*it)->player_id() == fullscreen_player_id_)
+      fullscreen_player_is_released_ = true;
+    (*it)->Release();
+  }
+}
+
 void BrowserMediaPlayerManager::OnSeekComplete(
     int player_id,
     const base::TimeDelta& current_time) {