Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/fast/overflow/overflow-x-y-expected.txt

Index: LayoutTests/platform/linux/fast/overflow/overflow-x-y-expected.txt
diff --git a/LayoutTests/platform/linux/fast/overflow/overflow-x-y-expected.txt b/LayoutTests/platform/linux/fast/overflow/overflow-x-y-expected.txt
index 468e3a81d722dc8c295740f8190208f58c616c07..857643517d6af363a864e4c72a4f382c9b776892 100644
--- a/LayoutTests/platform/linux/fast/overflow/overflow-x-y-expected.txt
+++ b/LayoutTests/platform/linux/fast/overflow/overflow-x-y-expected.txt
@@ -14,58 +14,58 @@ layer at (8,28) size 300x100 clip at (8,28) size 285x100 scrollHeight 360
   RenderBlock {DIV} at (0,20) size 300x100
     RenderText {#text} at (0,0) size 47x19
       text run at (0,0) width 47: "Y scroll"
-    RenderBR {BR} at (47,15) size 0x0
+    LayoutBR {BR} at (47,15) size 0x0
     RenderText {#text} at (0,20) size 47x19
       text run at (0,20) width 47: "Y scroll"
-    RenderBR {BR} at (47,35) size 0x0
+    LayoutBR {BR} at (47,35) size 0x0
     RenderText {#text} at (0,40) size 47x19
       text run at (0,40) width 47: "Y scroll"
-    RenderBR {BR} at (47,55) size 0x0
+    LayoutBR {BR} at (47,55) size 0x0
     RenderText {#text} at (0,60) size 47x19
       text run at (0,60) width 47: "Y scroll"
-    RenderBR {BR} at (47,75) size 0x0
+    LayoutBR {BR} at (47,75) size 0x0
     RenderText {#text} at (0,80) size 47x19
       text run at (0,80) width 47: "Y scroll"
-    RenderBR {BR} at (47,95) size 0x0
+    LayoutBR {BR} at (47,95) size 0x0
     RenderText {#text} at (0,100) size 47x19
       text run at (0,100) width 47: "Y scroll"
-    RenderBR {BR} at (47,115) size 0x0
+    LayoutBR {BR} at (47,115) size 0x0
     RenderText {#text} at (0,120) size 47x19
       text run at (0,120) width 47: "Y scroll"
-    RenderBR {BR} at (47,135) size 0x0
+    LayoutBR {BR} at (47,135) size 0x0
     RenderText {#text} at (0,140) size 47x19
       text run at (0,140) width 47: "Y scroll"
-    RenderBR {BR} at (47,155) size 0x0
+    LayoutBR {BR} at (47,155) size 0x0
     RenderText {#text} at (0,160) size 47x19
       text run at (0,160) width 47: "Y scroll"
-    RenderBR {BR} at (47,175) size 0x0
+    LayoutBR {BR} at (47,175) size 0x0
     RenderText {#text} at (0,180) size 47x19
       text run at (0,180) width 47: "Y scroll"
-    RenderBR {BR} at (47,195) size 0x0
+    LayoutBR {BR} at (47,195) size 0x0
     RenderText {#text} at (0,200) size 47x19
       text run at (0,200) width 47: "Y scroll"
-    RenderBR {BR} at (47,215) size 0x0
+    LayoutBR {BR} at (47,215) size 0x0
     RenderText {#text} at (0,220) size 47x19
       text run at (0,220) width 47: "Y scroll"
-    RenderBR {BR} at (47,235) size 0x0
+    LayoutBR {BR} at (47,235) size 0x0
     RenderText {#text} at (0,240) size 47x19
       text run at (0,240) width 47: "Y scroll"
-    RenderBR {BR} at (47,255) size 0x0
+    LayoutBR {BR} at (47,255) size 0x0
     RenderText {#text} at (0,260) size 47x19
       text run at (0,260) width 47: "Y scroll"
-    RenderBR {BR} at (47,275) size 0x0
+    LayoutBR {BR} at (47,275) size 0x0
     RenderText {#text} at (0,280) size 47x19
       text run at (0,280) width 47: "Y scroll"
-    RenderBR {BR} at (47,295) size 0x0
+    LayoutBR {BR} at (47,295) size 0x0
     RenderText {#text} at (0,300) size 47x19
       text run at (0,300) width 47: "Y scroll"
-    RenderBR {BR} at (47,315) size 0x0
+    LayoutBR {BR} at (47,315) size 0x0
     RenderText {#text} at (0,320) size 47x19
       text run at (0,320) width 47: "Y scroll"
-    RenderBR {BR} at (47,335) size 0x0
+    LayoutBR {BR} at (47,335) size 0x0
     RenderText {#text} at (0,340) size 47x19
       text run at (0,340) width 47: "Y scroll"
-    RenderBR {BR} at (47,355) size 0x0
+    LayoutBR {BR} at (47,355) size 0x0
 layer at (8,128) size 300x100 clip at (8,128) size 300x85 scrollWidth 1118
   RenderBlock {DIV} at (0,120) size 300x100
     RenderText {#text} at (0,0) size 1118x19