Move and rename RenderBR to LayoutBR.

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

Index: LayoutTests/platform/mac/tables/mozilla/core/table_rules-expected.txt
diff --git a/LayoutTests/platform/mac/tables/mozilla/core/table_rules-expected.txt b/LayoutTests/platform/mac/tables/mozilla/core/table_rules-expected.txt
index 8fea7ae87a8cf182853a56356a9a537c53fd273d..f8472badd0233943fc2c3b39b4c272dd04bb6d3e 100644
--- a/LayoutTests/platform/mac/tables/mozilla/core/table_rules-expected.txt
+++ b/LayoutTests/platform/mac/tables/mozilla/core/table_rules-expected.txt
@@ -20,7 +20,7 @@ layer at (0,0) size 800x600
               RenderText {#text} at (1,1) size 32x18
                 text run at (1,1) width 32: "none"
       RenderBlock (anonymous) at (0,42) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,60) size 117x83 [border: none]
         LayoutTableSection {TBODY} at (0,0) size 116x41 [border: (1px solid #808080) none (1px solid #808080) none]
           LayoutTableRow {TR} at (0,0) size 116x21
@@ -53,7 +53,7 @@ layer at (0,0) size 800x600
               RenderText {#text} at (1,1) size 79x18
                 text run at (1,1) width 79: "row group 2"
       RenderBlock (anonymous) at (0,143) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,161) size 221x42 [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 73x18
                 text run at (1,1) width 73: "col group 2"
       RenderBlock (anonymous) at (0,203) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,221) size 70x43 [border: none]
         LayoutTableSection {TBODY} at (0,0) size 69x42
           LayoutTableRow {TR} at (0,0) size 69x21
@@ -107,7 +107,7 @@ layer at (0,0) size 800x600
               RenderText {#text} at (1,2) size 32x18
                 text run at (1,2) width 32: "rows"
       RenderBlock (anonymous) at (0,264) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,282) size 65x42 [border: none]
         LayoutTableSection {TBODY} at (0,0) size 64x41
           LayoutTableRow {TR} at (0,0) size 64x21
@@ -125,7 +125,7 @@ layer at (0,0) size 800x600
               RenderText {#text} at (2,1) size 26x18
                 text run at (2,1) width 26: "cols"
       RenderBlock (anonymous) at (0,324) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,342) size 55x43 [border: none]
         LayoutTableSection {TBODY} at (0,0) size 54x42
           LayoutTableRow {TR} at (0,0) size 54x21
@@ -143,4 +143,4 @@ layer at (0,0) size 800x600
               RenderText {#text} at (2,2) size 16x18
                 text run at (2,2) width 16: "all"
       RenderBlock (anonymous) at (0,385) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18