diff --git a/dom/html/HTMLMediaElement.cpp b/dom/html/HTMLMediaElement.cpp
index b569b43b7aad..d04b65513532 100644
--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -1653,7 +1653,7 @@ HTMLMediaElement::GetSrcObject() const
 void
 HTMLMediaElement::SetSrcObject(DOMMediaStream& aValue)
 {
-  SetMozSrcObject(&aValue);
+  SetSrcObject(&aValue);
 }
 
 void
@@ -1664,31 +1664,6 @@ HTMLMediaElement::SetSrcObject(DOMMediaStream* aValue)
   DoLoad();
 }
 
-// TODO: Remove prefixed versions soon (1183495)
-
-already_AddRefed<DOMMediaStream>
-HTMLMediaElement::GetMozSrcObject() const
-{
-  NS_ASSERTION(!mSrcAttrStream || mSrcAttrStream->GetPlaybackStream(),
-               "MediaStream should have been set up properly");
-  RefPtr<DOMMediaStream> stream = mSrcAttrStream;
-  return stream.forget();
-}
-
-void
-HTMLMediaElement::SetMozSrcObject(DOMMediaStream& aValue)
-{
-  SetMozSrcObject(&aValue);
-}
-
-void
-HTMLMediaElement::SetMozSrcObject(DOMMediaStream* aValue)
-{
-  mSrcAttrStream = aValue;
-  UpdateAudioChannelPlayingState();
-  DoLoad();
-}
-
 NS_IMETHODIMP HTMLMediaElement::GetMozAutoplayEnabled(bool *aAutoplayEnabled)
 {
   *aAutoplayEnabled = mAutoplayEnabled;
diff --git a/dom/html/HTMLMediaElement.h b/dom/html/HTMLMediaElement.h
index bf187aa3f15f..787e26b72cbb 100644
--- a/dom/html/HTMLMediaElement.h
+++ b/dom/html/HTMLMediaElement.h
@@ -644,11 +644,6 @@ public:
   void SetSrcObject(DOMMediaStream& aValue);
   void SetSrcObject(DOMMediaStream* aValue);
 
-  // TODO: remove prefixed versions soon (1183495).
-  already_AddRefed<DOMMediaStream> GetMozSrcObject() const;
-  void SetMozSrcObject(DOMMediaStream& aValue);
-  void SetMozSrcObject(DOMMediaStream* aValue);
-
   bool MozPreservesPitch() const
   {
     return mPreservesPitch;