Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/tables/mozilla/bugs/bug92143-expected.txt

Index: LayoutTests/platform/mac/tables/mozilla/bugs/bug92143-expected.txt
diff --git a/LayoutTests/platform/mac/tables/mozilla/bugs/bug92143-expected.txt b/LayoutTests/platform/mac/tables/mozilla/bugs/bug92143-expected.txt
index 318ad2e045a629bd55a62ebe8e4c9efe3d29cfe1..523a8e839cd157723d0e5863f2830a94f059f4c9 100644
--- a/LayoutTests/platform/mac/tables/mozilla/bugs/bug92143-expected.txt
+++ b/LayoutTests/platform/mac/tables/mozilla/bugs/bug92143-expected.txt
@@ -4,7 +4,7 @@ layer at (0,0) size 800x600
   RenderBlock {HTML} at (0,0) size 800x600
     RenderBody {BODY} at (8,8) size 784x584
       RenderBlock (anonymous) at (0,0) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,18) size 324x58 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 322x56
           LayoutTableRow {TR} at (0,0) size 322x56
@@ -15,12 +15,12 @@ layer at (0,0) size 800x600
                 text run at (46,19) width 273: "Now you can choose from 3 levels of junk"
                 text run at (1,37) width 34: "mail!"
       RenderBlock (anonymous) at (0,76) size 784x72
-        RenderBR {BR} at (0,0) size 0x18
-        RenderBR {BR} at (0,18) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,18) size 0x18
         RenderText {#text} at (0,36) size 447x18
           text run at (0,36) width 447: "the next table must overrun the visible part of the view (width=2400) "
-        RenderBR {BR} at (0,0) size 0x0
-        RenderBR {BR} at (0,54) size 0x18
+        LayoutBR {BR} at (0,0) size 0x0
+        LayoutBR {BR} at (0,54) size 0x18
       LayoutTable {TABLE} at (0,148) size 2402x58 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 2400x56
           LayoutTableRow {TR} at (0,0) size 2400x56