--- a/widget/windows/winrt/MetroWidget.h
+++ b/widget/windows/winrt/MetroWidget.h
@@ -118,17 +118,16 @@ public:
   // ShouldUseOffMainThreadCompositing is defined in base widget
   virtual bool  ShouldUseOffMainThreadCompositing();
   bool          ShouldUseMainThreadD3D10Manager();
   bool          ShouldUseBasicManager();
   virtual LayerManager* GetLayerManager(PLayerTransactionChild* aShadowManager = nullptr,
                                         LayersBackend aBackendHint = mozilla::layers::LAYERS_NONE,
                                         LayerManagerPersistence aPersistence = LAYER_MANAGER_CURRENT,
                                         bool* aAllowRetaining = nullptr);
-  virtual mozilla::layers::LayersBackend GetPreferredCompositorBackend() { return mozilla::layers::LAYERS_D3D11; }
 
   // IME related interfaces
   NS_IMETHOD_(void) SetInputContext(const InputContext& aContext,
                                     const InputContextAction& aAction);
   NS_IMETHOD_(nsIWidget::InputContext) GetInputContext();
   NS_IMETHOD    NotifyIME(NotificationToIME aNotification) MOZ_OVERRIDE;
   NS_IMETHOD    GetToggledKeyState(uint32_t aKeyCode, bool* aLEDState);
   NS_IMETHOD    NotifyIMEOfTextChange(uint32_t aStart,