Avoid compositing fixed-position elements if they cannot scroll

LayoutTests/virtual/softwarecompositing/layer-creation/fixed-position-change-out-of-view-in-view-expected.txt

Index: LayoutTests/virtual/softwarecompositing/layer-creation/fixed-position-change-out-of-view-in-view-expected.txt
diff --git a/LayoutTests/virtual/softwarecompositing/layer-creation/fixed-position-change-out-of-view-in-view-expected.txt b/LayoutTests/virtual/softwarecompositing/layer-creation/fixed-position-change-out-of-view-in-view-expected.txt
deleted file mode 100644
index f03254fea6a0eb8e1edc9e7a25c2a57133df6afb..0000000000000000000000000000000000000000
--- a/LayoutTests/virtual/softwarecompositing/layer-creation/fixed-position-change-out-of-view-in-view-expected.txt
+++ /dev/null
@@ -1,29 +0,0 @@
-Layer tree when the fixed elements are out-of-view (should be blank):
-Layer tree when the fixed elements are in-view (both fixed elements should have layers):
-(GraphicsLayer
-  (bounds 800.00 600.00)
-  (children 1
-    (GraphicsLayer
-      (bounds 800.00 600.00)
-      (contentsOpaque 1)
-      (children 2
-        (GraphicsLayer
-          (position 100.00 50.00)
-          (bounds 10.00 10.00)
-          (contentsOpaque 1)
-          (drawsContent 1)
-          (backgroundColor #C0C0C0)
-        )
-        (GraphicsLayer
-          (position 100.00 100.00)
-          (bounds 10.00 10.00)
-          (contentsOpaque 1)
-          (drawsContent 1)
-          (backgroundColor #C0C0C0)
-        )
-      )
-    )
-  )
-)
-Layer tree when the fixed elements are out-of-view again (should be blank):
-