Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/tables/mozilla/bugs/bug625-expected.txt

Index: LayoutTests/platform/mac/tables/mozilla/bugs/bug625-expected.txt
diff --git a/LayoutTests/platform/mac/tables/mozilla/bugs/bug625-expected.txt b/LayoutTests/platform/mac/tables/mozilla/bugs/bug625-expected.txt
index 206b15437815ce4d149a67b5983f6436af6d7fb3..766d8b1d5bef9c6e941a5c6553987877b794c371 100644
--- a/LayoutTests/platform/mac/tables/mozilla/bugs/bug625-expected.txt
+++ b/LayoutTests/platform/mac/tables/mozilla/bugs/bug625-expected.txt
@@ -5,7 +5,7 @@ layer at (0,0) size 800x600
     RenderBody {BODY} at (8,8) size 784x584
       RenderBlock {HR} at (0,0) size 1004x4 [border: (2px solid #000000)]
       RenderBlock (anonymous) at (0,12) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,30) size 642x217
         LayoutTableSection {TBODY} at (0,0) size 642x217
           LayoutTableRow {TR} at (0,0) size 642x27
@@ -19,6 +19,6 @@ layer at (0,0) size 800x600
               LayoutImage {IMG} at (0,0) size 40x1
             LayoutTableCell {TD} at (217,27) size 425x190 [r=1 c=2 rs=1 cs=1]
               LayoutImage {IMG} at (0,0) size 252x172 [border: (1px solid #000000)]
-              RenderBR {BR} at (252,172) size 0x0
+              LayoutBR {BR} at (252,172) size 0x0
               RenderText {#text} at (0,172) size 76x18
                 text run at (0,172) width 76: "Click Here!"