Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/fast/replaced/border-radius-clip-expected.txt

Index: LayoutTests/platform/mac/fast/replaced/border-radius-clip-expected.txt
diff --git a/LayoutTests/platform/mac/fast/replaced/border-radius-clip-expected.txt b/LayoutTests/platform/mac/fast/replaced/border-radius-clip-expected.txt
index 2ffdd76db9689e017421f2d3964b4d1cccb49d66..2e998b43af65bad2888b3475d5934a0a2fa074e9 100644
--- a/LayoutTests/platform/mac/fast/replaced/border-radius-clip-expected.txt
+++ b/LayoutTests/platform/mac/fast/replaced/border-radius-clip-expected.txt
@@ -5,21 +5,21 @@ layer at (0,0) size 785x928 backgroundClip at (0,0) size 785x600 clip at (0,0) s
     RenderBody {BODY} at (8,8) size 769x912
       RenderText {#text} at (0,0) size 467x18
         text run at (0,0) width 467: "All of the replaced elements below should be clipped to a border-radius. "
-      RenderBR {BR} at (0,0) size 0x0
+      LayoutBR {BR} at (0,0) size 0x0
       LayoutImage {IMG} at (0,18) size 100x100
       RenderText {#text} at (100,104) size 4x18
         text run at (100,104) width 4: " "
-      RenderBR {BR} at (0,0) size 0x0
+      LayoutBR {BR} at (0,0) size 0x0
       LayoutImage {INPUT} at (0,122) size 100x100
       RenderText {#text} at (100,208) size 4x18
         text run at (100,208) width 4: " "
-      RenderBR {BR} at (0,0) size 0x0
+      LayoutBR {BR} at (0,0) size 0x0
       RenderText {#text} at (304,366) size 4x18
         text run at (304,366) width 4: " "
-      RenderBR {BR} at (0,0) size 0x0
+      LayoutBR {BR} at (0,0) size 0x0
       RenderText {#text} at (300,520) size 4x18
         text run at (300,520) width 4: " "
-      RenderBR {BR} at (0,0) size 0x0
+      LayoutBR {BR} at (0,0) size 0x0
       RenderText {#text} at (0,0) size 0x0
 layer at (8,234) size 304x154
   LayoutIFrame {IFRAME} at (0,226) size 304x154 [border: (2px inset #EEEEEE)]