Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/tables/mozilla/bugs/bug1318-expected.txt

Index: LayoutTests/platform/mac/tables/mozilla/bugs/bug1318-expected.txt
diff --git a/LayoutTests/platform/mac/tables/mozilla/bugs/bug1318-expected.txt b/LayoutTests/platform/mac/tables/mozilla/bugs/bug1318-expected.txt
index 672800eefd24e8437766fda4bb0a471ed2ea73fe..0ba901000b740172ad1f11adf0410161f838c41c 100644
--- a/LayoutTests/platform/mac/tables/mozilla/bugs/bug1318-expected.txt
+++ b/LayoutTests/platform/mac/tables/mozilla/bugs/bug1318-expected.txt
@@ -7,15 +7,15 @@ layer at (0,0) size 800x600
         LayoutTableSection {TBODY} at (0,0) size 784x136
           LayoutTableRow {TR} at (0,0) size 784x74
             LayoutTableCell {TD} at (0,0) size 784x74 [r=0 c=0 rs=1 cs=4]
-              RenderBR {BR} at (392,1) size 0x18
+              LayoutBR {BR} at (392,1) size 0x18
               RenderInline {FONT} at (0,0) size 732x53
                 RenderText {#text} at (26,19) size 732x35
                   text run at (26,19) width 183: "The Supreme Court says "
                   text run at (208,19) width 550: "Wisconsin can continue using tuition vouchers to help poor parents send their"
                   text run at (210,37) width 223: "children to church-run schools. "
                   text run at (432,37) width 142: "What's your stand? "
-                RenderBR {BR} at (573,51) size 1x0
-                RenderBR {BR} at (392,55) size 0x17
+                LayoutBR {BR} at (573,51) size 1x0
+                LayoutBR {BR} at (392,55) size 0x17
               RenderText {#text} at (0,0) size 0x0
           LayoutTableRow {TR} at (0,74) size 784x21
             LayoutTableCell {TD} at (0,76) size 562x17 [r=1 c=0 rs=1 cs=1]