Convert fast/multicol/column-break-with-balancing (and related) to reftests.

LayoutTests/platform/linux/fast/multicol/vertical-lr/column-break-with-balancing-expected.txt

Index: LayoutTests/platform/linux/fast/multicol/vertical-lr/column-break-with-balancing-expected.txt
diff --git a/LayoutTests/platform/linux/fast/multicol/vertical-lr/column-break-with-balancing-expected.txt b/LayoutTests/platform/linux/fast/multicol/vertical-lr/column-break-with-balancing-expected.txt
deleted file mode 100644
index 51f52aaf4e39e3f6ce78ccc720598e913a7be030..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/linux/fast/multicol/vertical-lr/column-break-with-balancing-expected.txt
+++ /dev/null
@@ -1,163 +0,0 @@
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