Bug 1276572: [webm] Fix MediaRawDataQueue::PushFront. r=jwwang

We want to add MediaRawDataQueue aOther at the front, not at the back.

MozReview-Commit-ID: 9icTWzRqS4u

--HG--
extra : rebase_source : 2713cbe952461c520a420925040be2de257f0596

dom/media/webm/WebMDemuxer.h

@@ -42,7 +42,7 @@ class MediaRawDataQueue {
 
   void PushFront(MediaRawDataQueue&& aOther) {
     while (!aOther.mQueue.empty()) {
-      Push(aOther.PopFront());
+      PushFront(aOther.Pop());
     }
   }
 
@@ -52,6 +52,12 @@ class MediaRawDataQueue {
     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();