Convert fast/multicol/float-paginate to reftest.

LayoutTests/platform/linux/fast/multicol/float-paginate-expected.txt

Index: LayoutTests/platform/linux/fast/multicol/float-paginate-expected.txt
diff --git a/LayoutTests/platform/linux/fast/multicol/float-paginate-expected.txt b/LayoutTests/platform/linux/fast/multicol/float-paginate-expected.txt
deleted file mode 100644
index deba206e40334520cb88ba13cc707e6fee13f62f..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/linux/fast/multicol/float-paginate-expected.txt
+++ /dev/null
@@ -1,128 +0,0 @@
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