Rewrite fast/multicol/*nested-columns.html as reftests.

LayoutTests/platform/win-xp/fast/multicol/nested-columns-expected.txt

Index: LayoutTests/platform/win-xp/fast/multicol/nested-columns-expected.txt
diff --git a/LayoutTests/platform/win-xp/fast/multicol/nested-columns-expected.txt b/LayoutTests/platform/win-xp/fast/multicol/nested-columns-expected.txt
deleted file mode 100644
index 7dec752ada345206ba94a5988c10c6093e66d673..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/win-xp/fast/multicol/nested-columns-expected.txt
+++ /dev/null
@@ -1,79 +0,0 @@
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