--- a/dom/media/webm/WebMDemuxer.h
+++ b/dom/media/webm/WebMDemuxer.h
@@ -37,26 +37,32 @@ class MediaRawDataQueue {
   }
 
   void PushFront(already_AddRefed<MediaRawData>&& aItem) {
     mQueue.push_front(Move(aItem));
   }
 
   void PushFront(MediaRawDataQueue&& aOther) {
     while (!aOther.mQueue.empty()) {
-      Push(aOther.PopFront());
+      PushFront(aOther.Pop());
     }
   }
 
   already_AddRefed<MediaRawData> PopFront() {
     RefPtr<MediaRawData> result = mQueue.front().forget();
     mQueue.pop_front();
     return result.forget();
   }
 
+  already_AddRefed<MediaRawData> Pop() {
+    RefPtr<MediaRawData> result = mQueue.back().forget();
+    mQueue.pop_back();
+    return result.forget();
+  }
+
   void Reset() {
     while (!mQueue.empty()) {
       mQueue.pop_front();
     }
   }
 
   MediaRawDataQueue& operator=(const MediaRawDataQueue& aOther) {
     mQueue = aOther.mQueue;