Enable new multicol for testing and experimental web platform features.

LayoutTests/platform/linux/fast/multicol/column-rules-stacking-expected.txt

Index: LayoutTests/platform/linux/fast/multicol/column-rules-stacking-expected.txt
diff --git a/LayoutTests/platform/linux/fast/multicol/column-rules-stacking-expected.txt b/LayoutTests/platform/linux/fast/multicol/column-rules-stacking-expected.txt
deleted file mode 100644
index 41cfa5d7b69d51805f1e768643bce72a2836ced7..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/linux/fast/multicol/column-rules-stacking-expected.txt
+++ /dev/null
@@ -1,104 +0,0 @@
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