Update Android to use scoped_refptr<T>::get() rather than implicit "operator T*"

media/base/android/media_player_listener.cc

Index: media/base/android/media_player_listener.cc
diff --git a/media/base/android/media_player_listener.cc b/media/base/android/media_player_listener.cc
index 94cbfd14db3604beccd4aa48ff330cbd856bc6ab..730759eb30c9280ff3cdccc88c3e723a00f01cca 100644
--- a/media/base/android/media_player_listener.cc
+++ b/media/base/android/media_player_listener.cc
@@ -25,7 +25,7 @@ MediaPlayerListener::MediaPlayerListener(
     base::WeakPtr<MediaPlayerBridge> media_player)
     : message_loop_(message_loop),
       media_player_(media_player) {
-  DCHECK(message_loop_);
+  DCHECK(message_loop_.get());
   DCHECK(media_player_);
 }