Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/scrollbars/scrollbar-buttons-expected.txt

Index: LayoutTests/platform/mac/scrollbars/scrollbar-buttons-expected.txt
diff --git a/LayoutTests/platform/mac/scrollbars/scrollbar-buttons-expected.txt b/LayoutTests/platform/mac/scrollbars/scrollbar-buttons-expected.txt
index e79ec07604ff05cd4b4d4367786f33bf0cc231b2..92305f75bef9483aef475729a5fa37570aa8eea6 100644
--- a/LayoutTests/platform/mac/scrollbars/scrollbar-buttons-expected.txt
+++ b/LayoutTests/platform/mac/scrollbars/scrollbar-buttons-expected.txt
@@ -7,133 +7,133 @@ layer at (8,8) size 200x200 clip at (8,8) size 183x200 scrollWidth 323 scrollHei
   RenderBlock {DIV} at (0,0) size 200x200
     RenderText {#text} at (0,0) size 36x18
       text run at (0,0) width 36: "Hello"
-    RenderBR {BR} at (35,14) size 1x0
+    LayoutBR {BR} at (35,14) size 1x0
     RenderText {#text} at (0,18) size 36x18
       text run at (0,18) width 36: "Hello"
-    RenderBR {BR} at (35,32) size 1x0
+    LayoutBR {BR} at (35,32) size 1x0
     RenderText {#text} at (0,36) size 36x18
       text run at (0,36) width 36: "Hello"
-    RenderBR {BR} at (35,50) size 1x0
+    LayoutBR {BR} at (35,50) size 1x0
     RenderText {#text} at (0,54) size 36x18
       text run at (0,54) width 36: "Hello"
-    RenderBR {BR} at (35,68) size 1x0
+    LayoutBR {BR} at (35,68) size 1x0
     RenderText {#text} at (0,72) size 36x18
       text run at (0,72) width 36: "Hello"
-    RenderBR {BR} at (35,86) size 1x0
+    LayoutBR {BR} at (35,86) size 1x0
     RenderText {#text} at (0,90) size 36x18
       text run at (0,90) width 36: "Hello"
-    RenderBR {BR} at (35,104) size 1x0
+    LayoutBR {BR} at (35,104) size 1x0
     RenderText {#text} at (0,108) size 36x18
       text run at (0,108) width 36: "Hello"
-    RenderBR {BR} at (35,122) size 1x0
+    LayoutBR {BR} at (35,122) size 1x0
     RenderText {#text} at (0,126) size 36x18
       text run at (0,126) width 36: "Hello"
-    RenderBR {BR} at (35,140) size 1x0
+    LayoutBR {BR} at (35,140) size 1x0
     RenderText {#text} at (0,144) size 36x18
       text run at (0,144) width 36: "Hello"
-    RenderBR {BR} at (35,158) size 1x0
+    LayoutBR {BR} at (35,158) size 1x0
     RenderText {#text} at (0,162) size 36x18
       text run at (0,162) width 36: "Hello"
-    RenderBR {BR} at (35,176) size 1x0
+    LayoutBR {BR} at (35,176) size 1x0
     RenderText {#text} at (0,180) size 36x18
       text run at (0,180) width 36: "Hello"
-    RenderBR {BR} at (35,194) size 1x0
+    LayoutBR {BR} at (35,194) size 1x0
     RenderText {#text} at (0,198) size 36x18
       text run at (0,198) width 36: "Hello"
-    RenderBR {BR} at (35,212) size 1x0
+    LayoutBR {BR} at (35,212) size 1x0
     RenderText {#text} at (0,216) size 36x18
       text run at (0,216) width 36: "Hello"
-    RenderBR {BR} at (35,230) size 1x0
+    LayoutBR {BR} at (35,230) size 1x0
     RenderText {#text} at (0,234) size 36x18
       text run at (0,234) width 36: "Hello"
-    RenderBR {BR} at (35,248) size 1x0
+    LayoutBR {BR} at (35,248) size 1x0
     RenderText {#text} at (0,252) size 36x18
       text run at (0,252) width 36: "Hello"
-    RenderBR {BR} at (35,266) size 1x0
+    LayoutBR {BR} at (35,266) size 1x0
     RenderText {#text} at (0,270) size 36x18
       text run at (0,270) width 36: "Hello"
-    RenderBR {BR} at (35,284) size 1x0
+    LayoutBR {BR} at (35,284) size 1x0
     RenderInline {SPAN} at (0,0) size 324x18
       RenderText {#text} at (0,288) size 324x18
         text run at (0,288) width 324: "Hello world this is a long string and will not wrap."
     RenderText {#text} at (0,306) size 36x18
       text run at (0,306) width 36: "Hello"
-    RenderBR {BR} at (35,320) size 1x0
+    LayoutBR {BR} at (35,320) size 1x0
     RenderText {#text} at (0,324) size 36x18
       text run at (0,324) width 36: "Hello"
-    RenderBR {BR} at (35,338) size 1x0
+    LayoutBR {BR} at (35,338) size 1x0
     RenderText {#text} at (0,342) size 36x18
       text run at (0,342) width 36: "Hello"
-    RenderBR {BR} at (35,356) size 1x0
+    LayoutBR {BR} at (35,356) size 1x0
     RenderText {#text} at (0,360) size 36x18
       text run at (0,360) width 36: "Hello"
-    RenderBR {BR} at (35,374) size 1x0
+    LayoutBR {BR} at (35,374) size 1x0
     RenderText {#text} at (0,378) size 36x18
       text run at (0,378) width 36: "Hello"
-    RenderBR {BR} at (35,392) size 1x0
+    LayoutBR {BR} at (35,392) size 1x0
     RenderText {#text} at (0,396) size 36x18
       text run at (0,396) width 36: "Hello"
-    RenderBR {BR} at (35,410) size 1x0
+    LayoutBR {BR} at (35,410) size 1x0
     RenderText {#text} at (0,414) size 36x18
       text run at (0,414) width 36: "Hello"
-    RenderBR {BR} at (35,428) size 1x0
+    LayoutBR {BR} at (35,428) size 1x0
     RenderText {#text} at (0,432) size 36x18
       text run at (0,432) width 36: "Hello"
-    RenderBR {BR} at (35,446) size 1x0
+    LayoutBR {BR} at (35,446) size 1x0
     RenderText {#text} at (0,450) size 36x18
       text run at (0,450) width 36: "Hello"
-    RenderBR {BR} at (35,464) size 1x0
+    LayoutBR {BR} at (35,464) size 1x0
     RenderText {#text} at (0,468) size 36x18
       text run at (0,468) width 36: "Hello"
-    RenderBR {BR} at (35,482) size 1x0
+    LayoutBR {BR} at (35,482) size 1x0
     RenderText {#text} at (0,486) size 36x18
       text run at (0,486) width 36: "Hello"
-    RenderBR {BR} at (35,500) size 1x0
+    LayoutBR {BR} at (35,500) size 1x0
     RenderText {#text} at (0,504) size 36x18
       text run at (0,504) width 36: "Hello"
-    RenderBR {BR} at (35,518) size 1x0
+    LayoutBR {BR} at (35,518) size 1x0
     RenderText {#text} at (0,522) size 36x18
       text run at (0,522) width 36: "Hello"
-    RenderBR {BR} at (35,536) size 1x0
+    LayoutBR {BR} at (35,536) size 1x0
     RenderText {#text} at (0,540) size 36x18
       text run at (0,540) width 36: "Hello"
-    RenderBR {BR} at (35,554) size 1x0
+    LayoutBR {BR} at (35,554) size 1x0
     RenderText {#text} at (0,558) size 36x18
       text run at (0,558) width 36: "Hello"
-    RenderBR {BR} at (35,572) size 1x0
+    LayoutBR {BR} at (35,572) size 1x0
     RenderText {#text} at (0,576) size 36x18
       text run at (0,576) width 36: "Hello"
-    RenderBR {BR} at (35,590) size 1x0
+    LayoutBR {BR} at (35,590) size 1x0
     RenderText {#text} at (0,594) size 36x18
       text run at (0,594) width 36: "Hello"
-    RenderBR {BR} at (35,608) size 1x0
+    LayoutBR {BR} at (35,608) size 1x0
     RenderText {#text} at (0,612) size 36x18
       text run at (0,612) width 36: "Hello"
-    RenderBR {BR} at (35,626) size 1x0
+    LayoutBR {BR} at (35,626) size 1x0
     RenderText {#text} at (0,630) size 36x18
       text run at (0,630) width 36: "Hello"
-    RenderBR {BR} at (35,644) size 1x0
+    LayoutBR {BR} at (35,644) size 1x0
     RenderText {#text} at (0,648) size 36x18
       text run at (0,648) width 36: "Hello"
-    RenderBR {BR} at (35,662) size 1x0
+    LayoutBR {BR} at (35,662) size 1x0
     RenderText {#text} at (0,666) size 36x18
       text run at (0,666) width 36: "Hello"
-    RenderBR {BR} at (35,680) size 1x0
+    LayoutBR {BR} at (35,680) size 1x0
     RenderText {#text} at (0,684) size 36x18
       text run at (0,684) width 36: "Hello"
-    RenderBR {BR} at (35,698) size 1x0
+    LayoutBR {BR} at (35,698) size 1x0
     RenderText {#text} at (0,702) size 36x18
       text run at (0,702) width 36: "Hello"
-    RenderBR {BR} at (35,716) size 1x0
+    LayoutBR {BR} at (35,716) size 1x0
     RenderText {#text} at (0,720) size 36x18
       text run at (0,720) width 36: "Hello"
-    RenderBR {BR} at (35,734) size 1x0
+    LayoutBR {BR} at (35,734) size 1x0
     RenderText {#text} at (0,738) size 36x18
       text run at (0,738) width 36: "Hello"
-    RenderBR {BR} at (35,752) size 1x0
+    LayoutBR {BR} at (35,752) size 1x0
     RenderText {#text} at (0,756) size 36x18
       text run at (0,756) width 36: "Hello"
-    RenderBR {BR} at (35,770) size 1x0
+    LayoutBR {BR} at (35,770) size 1x0
     RenderText {#text} at (0,774) size 36x18
       text run at (0,774) width 36: "Hello"
-    RenderBR {BR} at (35,788) size 1x0
+    LayoutBR {BR} at (35,788) size 1x0