Rename/move counter rendering code to layout.

LayoutTests/platform/linux/css2.1/t1204-implied-01-c-expected.txt

Index: LayoutTests/platform/linux/css2.1/t1204-implied-01-c-expected.txt
diff --git a/LayoutTests/platform/linux/css2.1/t1204-implied-01-c-expected.txt b/LayoutTests/platform/linux/css2.1/t1204-implied-01-c-expected.txt
index 3638ee8cb65f0111d51bad392b36d1c980533f54..9f91ccd93b95647052eb15579193d3d3b2931eb5 100644
--- a/LayoutTests/platform/linux/css2.1/t1204-implied-01-c-expected.txt
+++ b/LayoutTests/platform/linux/css2.1/t1204-implied-01-c-expected.txt
@@ -9,14 +9,14 @@ layer at (0,0) size 800x100
       RenderBlock {DIV} at (0,36) size 784x20
         RenderInline {SPAN} at (0,0) size 12x19
           RenderInline {<pseudo:before>} at (0,0) size 12x19
-            RenderCounter at (0,0) size 8x19
+            LayoutCounter at (0,0) size 8x19
               text run at (0,0) width 8: "0"
             RenderTextFragment at (8,0) size 4x19
               text run at (8,0) width 4: " "
         RenderInline {SPAN} at (0,0) size 8x19
           RenderInline {SPAN} at (0,0) size 8x19
             RenderInline {<pseudo:before>} at (0,0) size 8x19
-              RenderCounter at (12,0) size 8x19
+              LayoutCounter at (12,0) size 8x19
                 text run at (12,0) width 8: "1"
               RenderTextFragment at (0,0) size 0x0
       RenderBlock {DIV} at (0,56) size 784x20