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

LayoutTests/platform/android/fast/regions/top-overflow-out-of-second-region-expected.txt

Index: LayoutTests/platform/android/fast/regions/top-overflow-out-of-second-region-expected.txt
diff --git a/LayoutTests/platform/android/fast/regions/top-overflow-out-of-second-region-expected.txt b/LayoutTests/platform/android/fast/regions/top-overflow-out-of-second-region-expected.txt
deleted file mode 100644
index c512c15473a9e81efbf9a4a885564b699eb43b04..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/android/fast/regions/top-overflow-out-of-second-region-expected.txt
+++ /dev/null
@@ -1,44 +0,0 @@
-layer at (0,0) size 800x600
-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x426
-  RenderBlock {HTML} at (0,0) size 800x426
-    RenderBody {BODY} at (8,16) size 784x402
-      RenderBlock {P} at (0,0) size 784x80
-        RenderText {#text} at (0,0) size 759x79
-          text run at (0,0) width 740: "In the test case below, the green block's width should not vary and should use the second region to determine its width. It is"
-          text run at (0,20) width 759: "overflowing upwards out of the blue block, and so the portion that overflows should continue to use the blue block's containing"
-          text run at (0,40) width 758: "block width. The blue block does not exist in region one, so using some hypothetical made-up width is incorrect. The overflow"
-          text run at (0,60) width 449: "should be spilling out of the top of region two and be painted in region one."
-      RenderBlock {DIV} at (0,96) size 784x306
-layer at (8,104) size 302x102
-  RenderBlock {DIV} at (0,0) size 302x102 [border: (1px solid #000000)]
-    RenderNamedFlowFragment at (1,1) size 300x100
-layer at (8,206) size 402x202
-  RenderBlock {DIV} at (0,102) size 402x202 [border: (1px solid #000000)]
-    RenderNamedFlowFragment at (1,1) size 400x200
-layer at (8,408) size 2x2
-  RenderBlock {DIV} at (0,304) size 2x2 [border: (1px solid #000000)]
-    RenderNamedFlowFragment at (1,1) size 0x0
-Named flows
-  Named flow 'flow1'
-    layer at (0,0) size 400x300
-      RenderNamedFlowThread at (0,0) size 400x300
-        RenderBlock {DIV} at (0,0) size 400x183
-          RenderBlock {DIV} at (5,100) size 390x78 [border: (1px solid #0000FF)]
-            RenderBlock {DIV} at (48.50,-99) size 293x176 [border: (1px solid #008000)]
-              RenderBlock {P} at (1,17) size 291x60
-                RenderText {#text} at (0,0) size 291x59
-                  text run at (0,0) width 291: "These lines should all fit to the width of the"
-                  text run at (0,20) width 291: "block in the second region and spill out of the"
-                  text run at (0,40) width 109: "top of the second "
-                  text run at (109,40) width 41: "region."
-              RenderBlock {P} at (1,99) size 291x60
-                RenderText {#text} at (0,0) size 291x59
-                  text run at (0,0) width 291: "These lines should all fit to the width of the"
-                  text run at (0,20) width 291: "block in the second region and spill out of the"
-                  text run at (0,40) width 109: "top of the second "
-                  text run at (109,40) width 41: "region."
-    Regions for named flow 'flow1'
-      RenderNamedFlowFragment (anonymous child of {DIV} #region1)
-      RenderNamedFlowFragment (anonymous child of {DIV} #region2)
-      RenderNamedFlowFragment (anonymous child of {DIV} #region3)