Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/virtual/slimmingpaint/fast/text/whitespace/024-expected.txt

Index: LayoutTests/platform/linux/virtual/slimmingpaint/fast/text/whitespace/024-expected.txt
diff --git a/LayoutTests/platform/linux/virtual/slimmingpaint/fast/text/whitespace/024-expected.txt b/LayoutTests/platform/linux/virtual/slimmingpaint/fast/text/whitespace/024-expected.txt
index 15a4888a91d4bf38c489d60fc8ca6a2cd81d3b93..c844b99f75872de0ae88c3f4964c0171617188ea 100644
--- a/LayoutTests/platform/linux/virtual/slimmingpaint/fast/text/whitespace/024-expected.txt
+++ b/LayoutTests/platform/linux/virtual/slimmingpaint/fast/text/whitespace/024-expected.txt
@@ -61,7 +61,7 @@ layer at (0,0) size 785x1239 backgroundClip at (0,0) size 785x600 clip at (0,0)
                 text run at (1,1) width 326: "The blank line between '2003' and the nested element "
                 text run at (327,1) width 133: "triggers the width bug."
       RenderBlock (anonymous) at (0,415.25) size 769x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       RenderBlock {H2} at (0,455.16) size 769x27
         RenderText {#text} at (0,0) size 108x26
           text run at (0,0) width 108: "Example 2"
@@ -102,7 +102,7 @@ layer at (0,0) size 785x1239 backgroundClip at (0,0) size 785x600 clip at (0,0)
                   text run at (337,0) width 230: "number of characters contained by the"
                   text run at (0,20) width 93: "nested element."
       RenderBlock (anonymous) at (0,683.06) size 769x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       RenderBlock {H2} at (0,722.97) size 769x27
         RenderText {#text} at (0,0) size 108x26
           text run at (0,0) width 108: "Example 3"
@@ -137,7 +137,7 @@ layer at (0,0) size 785x1239 backgroundClip at (0,0) size 785x600 clip at (0,0)
                 text run at (327,1) width 216: "has been removed, so the bug is not"
                 text run at (1,21) width 57: "triggered."
       RenderBlock (anonymous) at (0,934.88) size 769x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       RenderBlock {H2} at (0,974.78) size 769x27
         RenderText {#text} at (0,0) size 108x26
           text run at (0,0) width 108: "Example 4"
@@ -176,4 +176,4 @@ layer at (0,0) size 785x1239 backgroundClip at (0,0) size 785x600 clip at (0,0)
                 text run at (1,21) width 219: "now the '2003' is itself contained by "
                 text run at (220,21) width 281: "a nested element (in this case, another SPAN)."
       RenderBlock (anonymous) at (0,1202.69) size 769x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19