[Media, Controls] Use a weak ref to the listener from callback.

third_party/WebKit/Source/modules/media_controls/MediaControlsMediaEventListener.cpp

Index: third_party/WebKit/Source/modules/media_controls/MediaControlsMediaEventListener.cpp
diff --git a/third_party/WebKit/Source/modules/media_controls/MediaControlsMediaEventListener.cpp b/third_party/WebKit/Source/modules/media_controls/MediaControlsMediaEventListener.cpp
index fe3bdc469af4961c83b696dd70ed268674f2a9c5..69df9e8bafcf4867f77b9aeae4ea6d1eaa3c805d 100644
--- a/third_party/WebKit/Source/modules/media_controls/MediaControlsMediaEventListener.cpp
+++ b/third_party/WebKit/Source/modules/media_controls/MediaControlsMediaEventListener.cpp
@@ -68,7 +68,7 @@ void MediaControlsMediaEventListener::Attach() {
           remote->WatchAvailabilityInternal(new AvailabilityCallbackWrapper(
               WTF::Bind(&MediaControlsMediaEventListener::
                             OnRemotePlaybackAvailabilityChanged,
-                        WrapPersistent(this))));
+                        WrapWeakPersistent(this))));
     }
   }
 }