Remove CSS regions support, keeping a bare minimum to support "region-based" multicol.

LayoutTests/platform/win/fast/regions/text-region-split-small-pagination-expected.txt

Index: LayoutTests/platform/win/fast/regions/text-region-split-small-pagination-expected.txt
diff --git a/LayoutTests/platform/win/fast/regions/text-region-split-small-pagination-expected.txt b/LayoutTests/platform/win/fast/regions/text-region-split-small-pagination-expected.txt
deleted file mode 100644
index c8f0e3cfe09befc99a09049ba24180afe6db24c7..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/win/fast/regions/text-region-split-small-pagination-expected.txt
+++ /dev/null
@@ -1,45 +0,0 @@
-layer at (0,0) size 800x600
-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x276
-  RenderBlock {HTML} at (0,0) size 800x276
-    RenderBody {BODY} at (8,16) size 784x244
-layer at (8,16) size 204x34
-  RenderBlock {DIV} at (0,0) size 204x34 [border: (2px solid #000000)]
-    RenderNamedFlowFragment at (2,2) size 200x30
-layer at (8,66) size 204x54
-  RenderBlock {DIV} at (0,50) size 204x54 [border: (2px solid #000000)]
-    RenderNamedFlowFragment at (2,2) size 200x50
-layer at (8,136) size 204x54
-  RenderBlock {DIV} at (0,120) size 204x54 [border: (2px solid #000000)]
-    RenderNamedFlowFragment at (2,2) size 200x50
-layer at (8,206) size 204x54
-  RenderBlock {DIV} at (0,190) size 204x54 [border: (2px solid #000000)]
-    RenderNamedFlowFragment at (2,2) size 200x50
-Named flows
-  Named flow 'flow'
-    layer at (0,0) size 200x180
-      RenderNamedFlowThread at (0,0) size 200x180
-        RenderBlock {DIV} at (0,30) size 200x120
-          RenderBlock {P} at (0,0) size 200x120
-            RenderInline {B} at (0,0) size 109x19
-              RenderText {#text} at (0,0) size 109x19
-                text run at (0,0) width 109: "Text in region 2."
-            RenderText {#text} at (109,0) size 138x39
-              text run at (109,0) width 29: " This"
-              text run at (0,20) width 94: "paragraph has \""
-            RenderInline {I} at (0,0) size 193x49
-              RenderText {#text} at (94,20) size 193x49
-                text run at (94,20) width 99: "-webkit-region-"
-                text run at (0,50) width 126: "break-after: always"
-            RenderText {#text} at (126,50) size 13x19
-              text run at (126,50) width 13: "\". "
-            RenderInline {B} at (0,0) size 179x69
-              RenderText {#text} at (139,50) size 179x69
-                text run at (139,50) width 40: "There"
-                text run at (0,70) width 160: "should be nothing in this"
-                text run at (0,100) width 138: "region after this line."
-    Regions for named flow 'flow'
-      RenderNamedFlowFragment (anonymous child of {DIV} #region1)
-      RenderNamedFlowFragment (anonymous child of {DIV} #region2)
-      RenderNamedFlowFragment (anonymous child of {DIV} #region3)
-      RenderNamedFlowFragment (anonymous child of {DIV} #region4)