Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/tables/mozilla/core/table_rules-expected.txt

Index: LayoutTests/platform/linux/tables/mozilla/core/table_rules-expected.txt
diff --git a/LayoutTests/platform/linux/tables/mozilla/core/table_rules-expected.txt b/LayoutTests/platform/linux/tables/mozilla/core/table_rules-expected.txt
index 08c19c3aa794358629d358359c7b3b82b7bee14c..7bd0e3003483883e92366322a05436a843768d48 100644
--- a/LayoutTests/platform/linux/tables/mozilla/core/table_rules-expected.txt
+++ b/LayoutTests/platform/linux/tables/mozilla/core/table_rules-expected.txt
@@ -20,7 +20,7 @@ layer at (0,0) size 800x600
               RenderText {#text} at (1,1) size 29x19
                 text run at (1,1) width 29: "none"
       RenderBlock (anonymous) at (0,46) size 784x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       LayoutTable {TABLE} at (0,66) size 109x91 [border: none]
         LayoutTableSection {TBODY} at (0,0) size 108x45 [border: (1px solid #808080) none (1px solid #808080) none]
           LayoutTableRow {TR} at (0,0) size 108x23
@@ -53,7 +53,7 @@ layer at (0,0) size 800x600
               RenderText {#text} at (1,1) size 75x19
                 text run at (1,1) width 75: "row group 2"
       RenderBlock (anonymous) at (0,157) size 784x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       LayoutTable {TABLE} at (0,177) size 205x46 [border: none]
         LayoutTableCol {COLGROUP} at (0,0) size 0x0 [border: none (1px solid #000000) none (1px solid #000000)]
           LayoutTableCol {COL} at (0,0) size 0x0
@@ -89,7 +89,7 @@ layer at (0,0) size 800x600
               RenderText {#text} at (1,1) size 69x19
                 text run at (1,1) width 69: "col group 2"
       RenderBlock (anonymous) at (0,223) size 784x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       LayoutTable {TABLE} at (0,243) size 64x47 [border: none]
         LayoutTableSection {TBODY} at (0,0) size 63x46
           LayoutTableRow {TR} at (0,0) size 63x23
@@ -107,7 +107,7 @@ layer at (0,0) size 800x600
               RenderText {#text} at (1,2) size 30x19
                 text run at (1,2) width 30: "rows"
       RenderBlock (anonymous) at (0,290) size 784x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       LayoutTable {TABLE} at (0,310) size 59x46 [border: none]
         LayoutTableSection {TBODY} at (0,0) size 58x45
           LayoutTableRow {TR} at (0,0) size 58x23
@@ -125,7 +125,7 @@ layer at (0,0) size 800x600
               RenderText {#text} at (2,1) size 24x19
                 text run at (2,1) width 24: "cols"
       RenderBlock (anonymous) at (0,356) size 784x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       LayoutTable {TABLE} at (0,376) size 48x47 [border: none]
         LayoutTableSection {TBODY} at (0,0) size 47x46
           LayoutTableRow {TR} at (0,0) size 47x23
@@ -143,4 +143,4 @@ layer at (0,0) size 800x600
               RenderText {#text} at (2,2) size 13x19
                 text run at (2,2) width 13: "all"
       RenderBlock (anonymous) at (0,423) size 784x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19