Backed out changeset 97e9ac5785f5 (bug 1213154) for bc7 test failures

dom/html/HTMLMediaElement.cpp

@@ -4727,12 +4727,6 @@ HTMLMediaElement::IsPlayingThroughTheAudioChannel() const
     return false;
   }
 
-  // We should consider any bfcached page or inactive document/channel as
-  // non-playing.
-  if (mPausedForInactiveDocumentOrChannel) {
-    return false;
-  }
-
   // A loop always is playing
   if (HasAttr(kNameSpaceID_None, nsGkAtoms::loop)) {
     return true;