--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -6536,17 +6536,17 @@ HTMLMediaElement::ShouldElementBePaused(
   if (!IsActive()) {
     return true;
   }
 
   return false;
 }
 
 void
-HTMLMediaElement::SetMediaInfo(const MediaInfo aInfo)
+HTMLMediaElement::SetMediaInfo(const MediaInfo& aInfo)
 {
   mMediaInfo = aInfo;
   AudioCaptureStreamChangeIfNeeded();
 }
 
 void
 HTMLMediaElement::AudioCaptureStreamChangeIfNeeded()
 {

--- a/dom/html/HTMLMediaElement.h
+++ b/dom/html/HTMLMediaElement.h
@@ -734,17 +734,17 @@ public:
   IMPL_EVENT_HANDLER(mozinterruptbegin)
   IMPL_EVENT_HANDLER(mozinterruptend)
 
   // These are used for testing only
   float ComputedVolume() const;
   bool ComputedMuted() const;
   nsSuspendedTypes ComputedSuspended() const;
 
-  void SetMediaInfo(const MediaInfo aInfo);
+  void SetMediaInfo(const MediaInfo& aInfo);
 
 protected:
   virtual ~HTMLMediaElement();
 
   class ChannelLoader;
   class MediaLoadListener;
   class MediaStreamTracksAvailableCallback;
   class MediaStreamTrackListener;