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

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

Index: LayoutTests/platform/win/fast/multicol/overflow-unsplittable-expected.txt
diff --git a/LayoutTests/platform/win/fast/multicol/overflow-unsplittable-expected.txt b/LayoutTests/platform/win/fast/multicol/overflow-unsplittable-expected.txt
deleted file mode 100644
index 1b355ddf98b19a56507751c0d818a750726e4c03..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/win/fast/multicol/overflow-unsplittable-expected.txt
+++ /dev/null
@@ -1,76 +0,0 @@
-layer at (0,0) size 800x600
-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x600
-  RenderBlock {HTML} at (0,0) size 800x600
-    RenderBody {BODY} at (8,8) size 784x584
-layer at (8,8) size 506x505
-  RenderBlock {DIV} at (0,0) size 506x505 [border: (3px solid #000000)]
-    RenderBlock (anonymous) at (3,3) size 158.66x360
-      RenderText {#text} at (0,4) size 158x351
-        text run at (0,4) width 158: "Lorem ipsum dolor sit amet,"
-        text run at (0,28) width 158: "consectetur adipiscing elit."
-        text run at (0,52) width 158: "Nullam ornare, nunc eget"
-        text run at (0,76) width 158: "condimentum tempor, augue"
-        text run at (0,100) width 158: "ligula accumsan eros, sed"
-        text run at (0,124) width 158: "consequat sapien orci id libero."
-        text run at (0,148) width 158: "Curabitur tristique, augue in"
-        text run at (0,172) width 158: "aliquet accumsan, nibh nisi"
-        text run at (0,196) width 158: "lobortis odio, et suscipit est"
-        text run at (0,220) width 158: "ligula eu nisi. Nunc aliquet"
-        text run at (0,244) width 158: "lobortis porta. Donec venenatis"
-        text run at (0,268) width 158: "consectetur eleifend. Etiam sed"
-        text run at (0,292) width 158: "tempor quam. Pellentesque"
-        text run at (0,316) width 158: "gravida gravida eros venenatis"
-        text run at (0,340) width 41: "suscipit."
-    RenderBlock (anonymous) at (3,806) size 158.66x675
-      RenderText {#text} at (0,4) size 158x666
-        text run at (0,4) width 158: "Nunc et odio ut velit posuere"
-        text run at (0,28) width 158: "viverra. Integer eu mi quis velit"
-        text run at (0,52) width 158: "dapibus tempus at ut purus."
-        text run at (0,76) width 158: "Quisque congue mollis mauris a"
-        text run at (0,100) width 158: "hendrerit. Nam viverra est at orci"
-        text run at (0,124) width 158: "interdum a ullamcorper mi"
-        text run at (0,148) width 158: "dictum. In id sapien augue."
-        text run at (0,172) width 158: "Suspendisse potenti. Vestibulum"
-        text run at (0,199) width 158: "turpis purus, convallis ut sagittis"
-        text run at (0,223) width 158: "quis, semper vel mauris."
-        text run at (0,247) width 158: "Curabitur vitae felis turpis."
-        text run at (0,271) width 158: "Fusce augue nibh, consectetur"
-        text run at (0,295) width 158: "non vestibulum et, bibendum sit"
-        text run at (0,319) width 158: "amet lectus. Nulla at imperdiet"
-        text run at (0,343) width 158: "metus. Donec non est velit, non"
-        text run at (0,367) width 158: "fringilla ipsum. Fusce elementum"
-        text run at (0,391) width 158: "neque a nibh egestas sodales."
-        text run at (0,415) width 158: "Mauris ut lorem hendrerit metus"
-        text run at (0,439) width 158: "interdum malesuada. Nam"
-        text run at (0,463) width 158: "tempus sodales neque vitae"
-        text run at (0,487) width 158: "bibendum. Vestibulum ac est sit"
-        text run at (0,511) width 158: "amet dolor vehicula semper at"
-        text run at (0,535) width 158: "sed ante. Nunc at neque urna, in"
-        text run at (0,559) width 158: "volutpat orci. Praesent eu velit"
-        text run at (0,583) width 158: "neque, quis rutrum metus. Nunc"
-        text run at (0,607) width 158: "eu ipsum sit amet ligula mattis"
-        text run at (0,631) width 158: "porttitor sit amet id felis. Integer"
-        text run at (0,655) width 155: "volutpat aliquam odio et feugiat."
-layer at (11,510) size 159x304 backgroundClip at (11,510) size 159x90 clip at (13,512) size 140x88 outlineClip at (0,0) size 800x600 scrollHeight 456
-  RenderBlock {DIV} at (3,502) size 159.47x304 [border: (2px solid #000000)]
-    RenderText {#text} at (2,6) size 140x447
-      text run at (2,6) width 140: "Aenean diam enim, suscipit"
-      text run at (2,30) width 140: "id pellentesque vel, hendrerit"
-      text run at (2,54) width 140: "et metus. Suspendisse felis"
-      text run at (2,78) width 140: "erat, hendrerit a congue in,"
-      text run at (2,102) width 140: "euismod ac erat. Donec"
-      text run at (2,126) width 140: "pulvinar venenatis tortor, a"
-      text run at (2,150) width 140: "lobortis erat scelerisque et."
-      text run at (2,174) width 140: "Class aptent taciti sociosqu"
-      text run at (2,198) width 140: "ad litora torquent per"
-      text run at (2,222) width 140: "conubia nostra, per inceptos"
-      text run at (2,246) width 140: "himenaeos. Aliquam in orci"
-      text run at (2,270) width 140: "id felis mollis porta ac et"
-      text run at (2,294) width 140: "orci. Donec viverra, eros ac"
-      text run at (2,318) width 140: "mattis dapibus, quam ante"
-      text run at (2,342) width 140: "porta lectus, accumsan"
-      text run at (2,366) width 140: "pellentesque nibh metus non"
-      text run at (2,390) width 140: "felis. Vivamus sed eros quis"
-      text run at (2,414) width 140: "magna scelerisque ultrices ac"
-      text run at (2,438) width 46: "eget velit."