Bring back multicol reftests that got DRTified for impl-side painting.

LayoutTests/platform/linux/virtual/regionbasedmulticol/fast/multicol/layers-in-multicol-expected.txt

Index: LayoutTests/platform/linux/virtual/regionbasedmulticol/fast/multicol/layers-in-multicol-expected.txt
diff --git a/LayoutTests/platform/linux/virtual/regionbasedmulticol/fast/multicol/layers-in-multicol-expected.txt b/LayoutTests/platform/linux/virtual/regionbasedmulticol/fast/multicol/layers-in-multicol-expected.txt
deleted file mode 100644
index 98dfeeb5dc5577006eff766b1978f95ad7475914..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/linux/virtual/regionbasedmulticol/fast/multicol/layers-in-multicol-expected.txt
+++ /dev/null
@@ -1,117 +0,0 @@
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-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x320
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-layer at (8,72) size 310x110
-  RenderBlock {DIV} at (0,56) size 310x110 [border: (5px solid #800000)]
-    RenderMultiColumnSet at (5,5) size 300x100
-layer at (13,77) size 100x280
-  RenderMultiColumnFlowThread at (5,5) size 100x280
-    RenderText {#text} at (0,0) size 28x19
-      text run at (0,0) width 28: "line1"
-    RenderBR {BR} at (28,0) size 0x19
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-    RenderText {#text} at (0,260) size 36x19
-      text run at (0,260) width 36: "line14"
-layer at (8,202) size 310x110
-  RenderBlock {DIV} at (0,186) size 310x110 [border: (5px solid #800000)]
-    RenderMultiColumnSet at (5,5) size 300x100
-layer at (213,207) size 100x280
-  RenderMultiColumnFlowThread at (205,5) size 100x280
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