Don't always repaint on zIndex change

LayoutTests/platform/win-xp/compositing/repaint/should-not-repaint-composited-descendants-expected.txt

Index: LayoutTests/platform/win-xp/compositing/repaint/should-not-repaint-composited-descendants-expected.txt
diff --git a/LayoutTests/platform/win-xp/compositing/repaint/should-not-repaint-composited-descendants-expected.txt b/LayoutTests/platform/win-xp/compositing/repaint/should-not-repaint-composited-descendants-expected.txt
deleted file mode 100644
index 4d8bd15165986af087a41ff662be7ba6d48b5e5b..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/win-xp/compositing/repaint/should-not-repaint-composited-descendants-expected.txt
+++ /dev/null
@@ -1,187 +0,0 @@
-position change with composited child
-
-position change with non-composited child
-
-z-index change with composited child
-
-z-index change with non-composited child
-
-opacity change with composited child
-
-opacity change with non-composited child
-
-transform change with composited child
-
-transform change with non-composited child
-
-filter change with composited child
-
-filter change with non-composited child
-
-clip change with composited child
-
-clip change with non-composited child
-
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-  (children 1
-    (GraphicsLayer
-      (bounds 785.00 2172.00)
-      (contentsOpaque 1)
-      (drawsContent 1)
-      (children 12
-        (GraphicsLayer
-          (position 8.00 80.00)
-          (bounds 100.00 100.00)
-          (children 1
-            (GraphicsLayer
-              (bounds 100.00 100.00)
-              (children 1
-                (GraphicsLayer
-                  (bounds 152.00 152.00)
-                  (contentsOpaque 1)
-                  (drawsContent 1)
-                  (backgroundColor #FFFF00)
-                )
-              )
-            )
-          )
-        )
-        (GraphicsLayer
-          (position 8.00 260.00)
-          (bounds 100.00 100.00)
-          (drawsContent 1)
-          (repaint rects
-            (rect 0.00 0.00 100.00 99.00)
-          )
-        )
-        (GraphicsLayer
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-          (bounds 100.00 100.00)
-          (opacity 0.50)
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-                  (bounds 152.00 152.00)
-                  (contentsOpaque 1)
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-                  (backgroundColor #FFFF00)
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-        (GraphicsLayer
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-          (bounds 100.00 100.00)
-          (opacity 0.50)
-          (drawsContent 1)
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-          (position 8.00 1159.00)
-          (bounds 100.00 100.00)
-          (transform [1.00 0.00 0.00 0.00] [0.00 1.00 0.00 0.00] [0.00 0.00 1.00 0.00] [0.00 0.00 20.00 1.00])
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-        (GraphicsLayer
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-        (GraphicsLayer
-          (position 8.00 620.00)
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-)
-