Bug 1574745 - Fix bustages on OS X Cross Compiled. a=bustage-fix CLOSED TREE

--HG--
extra : amend_source : 3fcae6bae609b58437fbc1e981dc00b03a3e3432

gfx/layers/composite/LayerManagerComposite.cpp

@@ -1057,7 +1057,7 @@ bool LayerManagerComposite::Render(const nsIntRegion& aInvalidRegion,
           mCompositor->GetWidget()->GetOpaqueWidgetRegion().ToUnknownRegion();
       opaqueRegion.AndWith(mRenderBounds);
       mNativeLayerForEntireWindow->SetOpaqueRegion(
-          opaqueRegion.MovedBy(-mRenderBounds.TopLeft());
+          opaqueRegion.MovedBy(-mRenderBounds.TopLeft()));
 #endif
 
       do {