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

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

Index: LayoutTests/fast/regions/text-region-split-small-pagination-expected.txt
diff --git a/LayoutTests/fast/regions/text-region-split-small-pagination-expected.txt b/LayoutTests/fast/regions/text-region-split-small-pagination-expected.txt
deleted file mode 100644
index b70a0aef75945abe988efac62ea0e8fb2dae41ca..0000000000000000000000000000000000000000
--- a/LayoutTests/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 200x118
-          RenderBlock {P} at (0,0) size 200x118
-            RenderInline {B} at (0,0) size 111x18
-              RenderText {#text} at (0,0) size 111x18
-                text run at (0,0) width 111: "Text in region 2."
-            RenderText {#text} at (111,0) size 143x36
-              text run at (111,0) width 32: " This"
-              text run at (0,18) width 99: "paragraph has \""
-            RenderInline {I} at (0,0) size 196x50
-              RenderText {#text} at (99,18) size 196x50
-                text run at (99,18) width 97: "-webkit-region-"
-                text run at (0,50) width 123: "break-after: always"
-            RenderText {#text} at (123,50) size 15x18
-              text run at (123,50) width 15: "\". "
-            RenderInline {B} at (0,0) size 179x68
-              RenderText {#text} at (138,50) size 179x68
-                text run at (138,50) width 41: "There"
-                text run at (0,68) width 166: "should be nothing in this"
-                text run at (0,100) width 139: "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)