Rewrite fast/multicol/positive-leading-expected.html as a reftest.

LayoutTests/platform/win/fast/multicol/positive-leading-expected.txt

Index: LayoutTests/platform/win/fast/multicol/positive-leading-expected.txt
diff --git a/LayoutTests/platform/win/fast/multicol/positive-leading-expected.txt b/LayoutTests/platform/win/fast/multicol/positive-leading-expected.txt
deleted file mode 100644
index 6cb7c4b8943dc87edbd9dc1c8554b1e592a0d1e8..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/win/fast/multicol/positive-leading-expected.txt
+++ /dev/null
@@ -1,68 +0,0 @@
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-layer at (0,0) size 800x600
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-layer at (8,8) size 506x505
-  RenderBlock {DIV} at (0,0) size 506x505 [border: (3px solid #000000)]
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