Rewrite fast/multicol/shadow-breaking.html as a check-layout test.

LayoutTests/platform/linux/fast/multicol/shadow-breaking-expected.txt

Index: LayoutTests/platform/linux/fast/multicol/shadow-breaking-expected.txt
diff --git a/LayoutTests/platform/linux/fast/multicol/shadow-breaking-expected.txt b/LayoutTests/platform/linux/fast/multicol/shadow-breaking-expected.txt
deleted file mode 100644
index 8ec400969f52fe49318fd1fa24ffb2b6403954b8..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/linux/fast/multicol/shadow-breaking-expected.txt
+++ /dev/null
@@ -1,38 +0,0 @@
-layer at (0,0) size 800x600
-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x8
-  RenderBlock {HTML} at (0,0) size 800x8
-    RenderBody {BODY} at (8,8) size 784x0
-      RenderBlock {DIV} at (0,0) size 784x0
-layer at (20,36) size 424x289
-  RenderBlock (positioned) {P} at (20,36) size 424x289 [border: (2px solid #000000)]
-    RenderBlock (floating) {<pseudo:first-letter>} at (2,2) size 24x43
-      RenderTextFragment at (0,1) size 24x41
-        text run at (0,1) width 24: "L"
-    RenderTextFragment {#text} at (30,2) size 200x553
-      text run at (30,2) width 172: "orem ipsum dolor sit"
-      text run at (30,22) width 172: "amet, consectetur"
-      text run at (2,42) width 200: "adipiscing elit. Cras pharetra"
-      text run at (2,62) width 200: "mollis pharetra. Suspendisse"
-      text run at (2,82) width 200: "lacinia orci et felis tristique sit"
-      text run at (2,102) width 200: "amet semper massa tempus."
-      text run at (2,122) width 200: "Suspendisse consectetur"
-      text run at (2,142) width 200: "tempor pulvinar. Proin dui"
-      text run at (2,162) width 200: "eros, ultricies vel malesuada"
-      text run at (2,182) width 200: "vel, tempor at ante. Nam eget"
-      text run at (2,202) width 200: "nisl dui. Donec molestie"
-      text run at (2,222) width 200: "lectus a nunc scelerisque"
-      text run at (2,242) width 200: "blandit. Nam non ligula"
-      text run at (2,296) width 200: "massa, sed suscipit turpis."
-      text run at (2,316) width 200: "Etiam eget ligula sit amet"
-      text run at (2,336) width 200: "turpis venenatis dictum in"
-      text run at (2,356) width 200: "eleifend augue. Duis tellus"
-      text run at (2,376) width 200: "lectus, volutpat et adipiscing"
-      text run at (2,396) width 200: "a, pellentesque eu metus."
-      text run at (2,416) width 200: "Aenean suscipit congue"
-      text run at (2,436) width 200: "mauris at gravida. Integer"
-      text run at (2,456) width 200: "lectus ligula, consectetur sit"
-      text run at (2,476) width 200: "amet venenatis id, scelerisque"
-      text run at (2,496) width 200: "eget nisl. Nunc dapibus"
-      text run at (2,516) width 200: "posuere risus, vitae tempor"
-      text run at (2,536) width 95: "nibh iaculis et."