diff --git a/image/DynamicImage.cpp b/image/DynamicImage.cpp
index a0431c84436c..0fef5e30f1b2 100644
--- a/image/DynamicImage.cpp
+++ b/image/DynamicImage.cpp
@@ -80,7 +80,7 @@ DynamicImage::OnImageDataComplete(nsIRequest* aRequest,
 }
 
 void
-DynamicImage::OnSurfaceDiscarded(SurfaceKey aSurfaceKey)
+DynamicImage::OnSurfaceDiscarded()
 { }
 
 void
diff --git a/image/DynamicImage.h b/image/DynamicImage.h
index 06e21aef7e4b..751bed82a140 100644
--- a/image/DynamicImage.h
+++ b/image/DynamicImage.h
@@ -53,7 +53,7 @@ public:
                                        nsresult aStatus,
                                        bool aLastPart) override;
 
-  virtual void OnSurfaceDiscarded(SurfaceKey aSurfaceKey) override;
+  virtual void OnSurfaceDiscarded() override;
 
   virtual void SetInnerWindowID(uint64_t aInnerWindowId) override;
   virtual uint64_t InnerWindowID() const override;
diff --git a/image/Image.h b/image/Image.h
index dca64d90dba4..5efa957ef4b3 100644
--- a/image/Image.h
+++ b/image/Image.h
@@ -216,7 +216,7 @@ public:
   /**
    * Called when the SurfaceCache discards a surface belonging to this image.
    */
-  virtual void OnSurfaceDiscarded(SurfaceKey aSurfaceKey) = 0;
+  virtual void OnSurfaceDiscarded() = 0;
 
   virtual void SetInnerWindowID(uint64_t aInnerWindowId) = 0;
   virtual uint64_t InnerWindowID() const = 0;
@@ -256,7 +256,7 @@ public:
   }
 #endif
 
-  virtual void OnSurfaceDiscarded(SurfaceKey aSurfaceKey) override { }
+  virtual void OnSurfaceDiscarded() override { }
 
   virtual void SetInnerWindowID(uint64_t aInnerWindowId) override
   {
diff --git a/image/ImageWrapper.cpp b/image/ImageWrapper.cpp
index c3335871e36c..f2bc3725ebf9 100644
--- a/image/ImageWrapper.cpp
+++ b/image/ImageWrapper.cpp
@@ -88,9 +88,9 @@ ImageWrapper::OnImageDataComplete(nsIRequest* aRequest,
 }
 
 void
-ImageWrapper::OnSurfaceDiscarded(SurfaceKey aSurfaceKey)
+ImageWrapper::OnSurfaceDiscarded()
 {
-  return mInnerImage->OnSurfaceDiscarded(aSurfaceKey);
+  return mInnerImage->OnSurfaceDiscarded();
 }
 
 void
diff --git a/image/ImageWrapper.h b/image/ImageWrapper.h
index e7aae3f90354..f60a1c09c3d2 100644
--- a/image/ImageWrapper.h
+++ b/image/ImageWrapper.h
@@ -45,7 +45,7 @@ public:
                                        nsresult aStatus,
                                        bool aLastPart) override;
 
-  virtual void OnSurfaceDiscarded(SurfaceKey aSurfaceKey) override;
+  virtual void OnSurfaceDiscarded() override;
 
   virtual void SetInnerWindowID(uint64_t aInnerWindowId) override;
   virtual uint64_t InnerWindowID() const override;
diff --git a/image/RasterImage.cpp b/image/RasterImage.cpp
index 99205b798177..f205835fd312 100644
--- a/image/RasterImage.cpp
+++ b/image/RasterImage.cpp
@@ -420,11 +420,11 @@ RasterImage::WillDrawOpaqueNow()
 }
 
 void
-RasterImage::OnSurfaceDiscarded(SurfaceKey aSurfaceKey)
+RasterImage::OnSurfaceDiscarded()
 {
   MOZ_ASSERT(mProgressTracker);
 
-  if (mAnimationState && aSurfaceKey.Playback() == PlaybackType::eAnimated) {
+  if (mAnimationState) {
     MOZ_ASSERT(gfxPrefs::ImageMemAnimatedDiscardable());
     mAnimationState->SetDiscarded(true);
   }
diff --git a/image/RasterImage.h b/image/RasterImage.h
index 9f4a10edf1be..c205f692c50f 100644
--- a/image/RasterImage.h
+++ b/image/RasterImage.h
@@ -164,7 +164,7 @@ public:
   virtual nsresult StopAnimation() override;
 
   // Methods inherited from Image
-  virtual void OnSurfaceDiscarded(SurfaceKey aSurfaceKey) override;
+  virtual void OnSurfaceDiscarded() override;
 
   virtual size_t SizeOfSourceWithComputedFallback(MallocSizeOf aMallocSizeOf)
     const override;
diff --git a/image/SurfaceCache.cpp b/image/SurfaceCache.cpp
index db26a7299faf..2ca3ca7eca1c 100644
--- a/image/SurfaceCache.cpp
+++ b/image/SurfaceCache.cpp
@@ -502,7 +502,7 @@ public:
 
     // If the surface was not a placeholder, tell its image that we discarded it.
     if (!aSurface->IsPlaceholder()) {
-      static_cast<Image*>(imageKey)->OnSurfaceDiscarded(aSurface->GetSurfaceKey());
+      static_cast<Image*>(imageKey)->OnSurfaceDiscarded();
     }
 
     StopTracking(aSurface);
diff --git a/image/VectorImage.cpp b/image/VectorImage.cpp
index 21ad0ce1d743..472bf55655f0 100644
--- a/image/VectorImage.cpp
+++ b/image/VectorImage.cpp
@@ -1123,7 +1123,7 @@ VectorImage::RequestDiscard()
 }
 
 void
-VectorImage::OnSurfaceDiscarded(SurfaceKey aSurfaceKey)
+VectorImage::OnSurfaceDiscarded()
 {
   MOZ_ASSERT(mProgressTracker);
 
diff --git a/image/VectorImage.h b/image/VectorImage.h
index a9600a72699f..e19aa939fbed 100644
--- a/image/VectorImage.h
+++ b/image/VectorImage.h
@@ -49,7 +49,7 @@ public:
                                        nsresult aResult,
                                        bool aLastPart) override;
 
-  virtual void OnSurfaceDiscarded(SurfaceKey aSurfaceKey) override;
+  virtual void OnSurfaceDiscarded() override;
 
   /**
    * Callback for SVGRootRenderingObserver.