Rewrite fast/multicol/overflow-unsplittable.html as a reftest.

LayoutTests/platform/mac/fast/multicol/overflow-unsplittable-expected.txt

Index: LayoutTests/platform/mac/fast/multicol/overflow-unsplittable-expected.txt
diff --git a/LayoutTests/platform/mac/fast/multicol/overflow-unsplittable-expected.txt b/LayoutTests/platform/mac/fast/multicol/overflow-unsplittable-expected.txt
deleted file mode 100644
index de418bc104b29ece7c9295669720668aec775e19..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/mac/fast/multicol/overflow-unsplittable-expected.txt
+++ /dev/null
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