Move and rename RenderBR to LayoutBR.

LayoutTests/platform/win-xp/fast/forms/basic-buttons-expected.txt

Index: LayoutTests/platform/win-xp/fast/forms/basic-buttons-expected.txt
diff --git a/LayoutTests/platform/win-xp/fast/forms/basic-buttons-expected.txt b/LayoutTests/platform/win-xp/fast/forms/basic-buttons-expected.txt
index 049cb94e1047943a740d7f526d1ca2c01a728aae..9b8aa8067f6c336591aaa91860744ee8cf58c015 100644
--- a/LayoutTests/platform/win-xp/fast/forms/basic-buttons-expected.txt
+++ b/LayoutTests/platform/win-xp/fast/forms/basic-buttons-expected.txt
@@ -6,14 +6,14 @@ layer at (0,0) size 800x353
       RenderBlock (anonymous) at (0,0) size 784x80
         RenderText {#text} at (0,0) size 515x19
           text run at (0,0) width 515: "Tests for basic button rendering. Creates a table with seven columns and seven rows. "
-        RenderBR {BR} at (515,0) size 0x19
+        LayoutBR {BR} at (515,0) size 0x19
         RenderText {#text} at (0,20) size 491x19
           text run at (0,20) width 491: "Creates two different types of buttons, one with an image (a red dot) and another "
-        RenderBR {BR} at (491,20) size 0x19
+        LayoutBR {BR} at (491,20) size 0x19
         RenderText {#text} at (0,40) size 617x19
           text run at (0,40) width 617: "with text (\"foo\") and then uses six different paddings to make sure each of the buttons render properly. "
-        RenderBR {BR} at (617,40) size 0x19
-        RenderBR {BR} at (0,60) size 0x19
+        LayoutBR {BR} at (617,40) size 0x19
+        LayoutBR {BR} at (0,60) size 0x19
       LayoutTable {TABLE} at (0,80) size 655x257
         LayoutTableSection {TBODY} at (0,0) size 655x257
           LayoutTableRow {TR} at (0,0) size 655x22