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

LayoutTests/platform/mac/fast/regions/multiple-directionality-changes-in-variable-width-regions-expected.txt

Index: LayoutTests/platform/mac/fast/regions/multiple-directionality-changes-in-variable-width-regions-expected.txt
diff --git a/LayoutTests/platform/mac/fast/regions/multiple-directionality-changes-in-variable-width-regions-expected.txt b/LayoutTests/platform/mac/fast/regions/multiple-directionality-changes-in-variable-width-regions-expected.txt
deleted file mode 100644
index 9536ad9462e37718f61691aacd3315c8b09ca4e5..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/mac/fast/regions/multiple-directionality-changes-in-variable-width-regions-expected.txt
+++ /dev/null
@@ -1,42 +0,0 @@
-layer at (0,0) size 800x600
-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x422
-  RenderBlock {HTML} at (0,0) size 800x422
-    RenderBody {BODY} at (8,8) size 784x406
-      RenderBlock {DIV} at (0,0) size 784x406
-layer at (8,8) size 402x102
-  RenderBlock {DIV} at (0,0) size 402x102 [border: (1px solid #000000)]
-    RenderNamedFlowFragment at (1,1) size 400x100
-layer at (8,110) size 502x182
-  RenderBlock {DIV} at (0,102) size 502x182 [border: (1px solid #000000)]
-    RenderNamedFlowFragment at (1,1) size 500x180
-layer at (8,292) size 202x122
-  RenderBlock {DIV} at (0,284) size 202x122 [border: (1px solid #000000)]
-    RenderNamedFlowFragment at (1,1) size 200x120
-Named flows
-  Named flow 'flow1'
-    layer at (0,0) size 500x400
-      RenderNamedFlowThread at (0,0) size 500x400
-        RenderBlock {DIV} at (25,0) size 450x372
-          RenderBlock {DIV} at (27,15) size 396x342 [border: (1px solid #0000FF)]
-            RenderBlock {DIV} at (40.39,11) size 315.22x249 [border: (1px solid #008000)]
-              RenderBlock {P} at (1,17) size 313.22x93
-                RenderText {#text} at (-17,0) size 331x93
-                  text run at (-17,0) width 247: "This line of text should not get out of"
-                  text run at (-17,18) width 247: "the region. This line of text should not"
-                  text run at (-17,36) width 247: "get out of the region. This line of text"
-                  text run at (0,57) width 313: "should not get out of the region. This line of text"
-                  text run at (0,75) width 201: "should not get out of the region."
-              RenderBlock {P} at (1,126) size 313.22x72
-                RenderText {#text} at (0,0) size 313x72
-                  text run at (0,0) width 313: "This line of text should not get out of the region."
-                  text run at (0,18) width 313: "This line of text should not get out of the region."
-                  text run at (0,36) width 313: "This line of text should not get out of the region."
-                  text run at (0,54) width 304: "This line of text should not get out of the region."
-              RenderBlock {P} at (1,214) size 313.22x18
-                RenderText {#text} at (0,0) size 304x18
-                  text run at (0,0) width 304: "This line of text should not get out of the region."
-    Regions for named flow 'flow1'
-      RenderNamedFlowFragment (anonymous child of {DIV} #region1)
-      RenderNamedFlowFragment (anonymous child of {DIV} #region2)
-      RenderNamedFlowFragment (anonymous child of {DIV} #region3)