[Android] Stop all media on undoable close.

content/browser/media/media_web_contents_observer.cc

Index: content/browser/media/media_web_contents_observer.cc
diff --git a/content/browser/media/media_web_contents_observer.cc b/content/browser/media/media_web_contents_observer.cc
index 0214eb52f68cea348b9cc3efa7b96f1326653f83..75a8f754ba038d8e708540675d8e0a8a1a4e694e 100644
--- a/content/browser/media/media_web_contents_observer.cc
+++ b/content/browser/media/media_web_contents_observer.cc
@@ -191,6 +191,13 @@ void MediaWebContentsObserver::PauseVideo() {
   }
 }
 
+void MediaWebContentsObserver::ReleaseAllMediaPlayers(
+    RenderFrameHost* render_frame_host) {
+  BrowserMediaPlayerManager* manager = GetMediaPlayerManager(render_frame_host);
+  if (manager)
+    manager->ReleaseAllMediaPlayers();
+}
+
 #if defined(VIDEO_HOLE)
 void MediaWebContentsObserver::OnFrameInfoUpdated() {
   for (MediaPlayerManagerMap::iterator iter = media_player_managers_.begin();