Fix WeakPtrFactory members in Android media classes

media/base/android/media_source_player.h

Index: media/base/android/media_source_player.h
diff --git a/media/base/android/media_source_player.h b/media/base/android/media_source_player.h
index e0922b6aed5a7085ea51c66d3a989dd469ee3778..5ef684ea9346103c3e943182506d272f31194760 100644
--- a/media/base/android/media_source_player.h
+++ b/media/base/android/media_source_player.h
@@ -273,9 +273,9 @@ class MEDIA_EXPORT MediaSourcePlayer : public MediaPlayerAndroid,
   bool prerolling_;
 
   // Weak pointer passed to media decoder jobs for callbacks.
+  base::WeakPtr<MediaSourcePlayer> weak_this_;
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<MediaSourcePlayer> weak_factory_;
-  base::WeakPtr<MediaSourcePlayer> weak_this_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaSourcePlayer);
 };