Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/tables/mozilla/core/nested1-expected.txt

Index: LayoutTests/platform/mac/tables/mozilla/core/nested1-expected.txt
diff --git a/LayoutTests/platform/mac/tables/mozilla/core/nested1-expected.txt b/LayoutTests/platform/mac/tables/mozilla/core/nested1-expected.txt
index 34e620fc97e42d7c89c539ae84d5e5298192ba1b..de50819dfad16dcec6a6f2cdc4e320f2f8eec7f9 100644
--- a/LayoutTests/platform/mac/tables/mozilla/core/nested1-expected.txt
+++ b/LayoutTests/platform/mac/tables/mozilla/core/nested1-expected.txt
@@ -14,7 +14,7 @@ layer at (0,0) size 800x600
                       RenderText {#text} at (1,1) size 180x18
                         text run at (1,1) width 180: "nested in auto, width=100%"
       RenderBlock (anonymous) at (0,34) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,52) size 200x52 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 198x50
           LayoutTableRow {TR} at (0,2) size 198x46
@@ -27,7 +27,7 @@ layer at (0,0) size 800x600
                         text run at (1,1) width 99: "nested in fixed,"
                         text run at (1,19) width 83: "width=100%"
       RenderBlock (anonymous) at (0,104) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,122) size 800x34 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 798x32
           LayoutTableRow {TR} at (0,2) size 798x28
@@ -39,7 +39,7 @@ layer at (0,0) size 800x600
                       RenderText {#text} at (1,1) size 185x18
                         text run at (1,1) width 185: "nested in fixed, width=100%"
       RenderBlock (anonymous) at (0,156) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,174) size 230x34 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 228x32
           LayoutTableRow {TR} at (0,2) size 228x28
@@ -54,7 +54,7 @@ layer at (0,0) size 800x600
               RenderText {#text} at (2,2) size 28x18
                 text run at (2,2) width 28: "auto"
       RenderBlock (anonymous) at (0,208) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,226) size 784x34 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 782x32
           LayoutTableRow {TR} at (0,2) size 782x28
@@ -69,7 +69,7 @@ layer at (0,0) size 800x600
               RenderText {#text} at (2,2) size 22x18
                 text run at (2,2) width 22: "foo"
       RenderBlock (anonymous) at (0,260) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,278) size 784x40 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 782x38
           LayoutTableRow {TR} at (0,2) size 782x34