Bug 1744087 - Remove some unused remnants from Layers.h/cpp. r=gfx-reviewers,bradwerth

Differential Revision: https://phabricator.services.mozilla.com/D132713

gfx/layers/Layers.cpp

@@ -83,11 +83,6 @@ void WriteSnapshotToDumpFile(Compositor* aCompositor, DrawTarget* aTarget) {
 }
 #endif
 
-//--------------------------------------------------
-// LayerManager
-
-void SetAntialiasingFlags(Layer* aLayer, DrawTarget* aTarget) {}
-
 IntRect ToOutsideIntRect(const gfxRect& aRect) {
   return IntRect::RoundOut(aRect.X(), aRect.Y(), aRect.Width(), aRect.Height());
 }

gfx/layers/Layers.h

@@ -119,8 +119,6 @@ class Layer {
   };
 };
 
-void SetAntialiasingFlags(Layer* aLayer, gfx::DrawTarget* aTarget);
-
 #ifdef MOZ_DUMP_PAINTING
 void WriteSnapshotToDumpFile(Layer* aLayer, gfx::DataSourceSurface* aSurf);
 void WriteSnapshotToDumpFile(Compositor* aCompositor, gfx::DrawTarget* aTarget);