Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/fast/overflow/overflow-float-stacking-expected.txt

Index: LayoutTests/platform/linux/fast/overflow/overflow-float-stacking-expected.txt
diff --git a/LayoutTests/platform/linux/fast/overflow/overflow-float-stacking-expected.txt b/LayoutTests/platform/linux/fast/overflow/overflow-float-stacking-expected.txt
index e79792765b0cf8d0823f0d797163d754c10ee92b..15834a056b4859bf7ed9196772a29c7181d83d66 100644
--- a/LayoutTests/platform/linux/fast/overflow/overflow-float-stacking-expected.txt
+++ b/LayoutTests/platform/linux/fast/overflow/overflow-float-stacking-expected.txt
@@ -16,142 +16,142 @@ layer at (8,28) size 300x300 clip at (8,28) size 285x300 scrollHeight 940
   RenderBlock (floating) {DIV} at (0,20) size 300x300 [bgcolor=#00FF00]
     RenderText {#text} at (0,0) size 71x19
       text run at (0,0) width 71: "Hello world"
-    RenderBR {BR} at (71,15) size 0x0
+    LayoutBR {BR} at (71,15) size 0x0
     RenderText {#text} at (0,20) size 71x19
       text run at (0,20) width 71: "Hello world"
-    RenderBR {BR} at (71,35) size 0x0
+    LayoutBR {BR} at (71,35) size 0x0
     RenderText {#text} at (0,40) size 71x19
       text run at (0,40) width 71: "Hello world"
-    RenderBR {BR} at (71,55) size 0x0
+    LayoutBR {BR} at (71,55) size 0x0
     RenderText {#text} at (0,60) size 71x19
       text run at (0,60) width 71: "Hello world"
-    RenderBR {BR} at (71,75) size 0x0
+    LayoutBR {BR} at (71,75) size 0x0
     RenderText {#text} at (0,80) size 71x19
       text run at (0,80) width 71: "Hello world"
-    RenderBR {BR} at (71,95) size 0x0
+    LayoutBR {BR} at (71,95) size 0x0
     RenderText {#text} at (0,100) size 71x19
       text run at (0,100) width 71: "Hello world"
-    RenderBR {BR} at (71,115) size 0x0
+    LayoutBR {BR} at (71,115) size 0x0
     RenderText {#text} at (0,120) size 71x19
       text run at (0,120) width 71: "Hello world"
-    RenderBR {BR} at (71,135) size 0x0
+    LayoutBR {BR} at (71,135) size 0x0
     RenderText {#text} at (0,140) size 71x19
       text run at (0,140) width 71: "Hello world"
-    RenderBR {BR} at (71,155) size 0x0
+    LayoutBR {BR} at (71,155) size 0x0
     RenderText {#text} at (0,160) size 71x19
       text run at (0,160) width 71: "Hello world"
-    RenderBR {BR} at (71,175) size 0x0
+    LayoutBR {BR} at (71,175) size 0x0
     RenderText {#text} at (0,180) size 71x19
       text run at (0,180) width 71: "Hello world"
-    RenderBR {BR} at (71,195) size 0x0
+    LayoutBR {BR} at (71,195) size 0x0
     RenderText {#text} at (0,200) size 71x19
       text run at (0,200) width 71: "Hello world"
-    RenderBR {BR} at (71,215) size 0x0
+    LayoutBR {BR} at (71,215) size 0x0
     RenderText {#text} at (0,220) size 71x19
       text run at (0,220) width 71: "Hello world"
-    RenderBR {BR} at (71,235) size 0x0
+    LayoutBR {BR} at (71,235) size 0x0
     RenderText {#text} at (0,240) size 71x19
       text run at (0,240) width 71: "Hello world"
-    RenderBR {BR} at (71,255) size 0x0
+    LayoutBR {BR} at (71,255) size 0x0
     RenderText {#text} at (0,260) size 71x19
       text run at (0,260) width 71: "Hello world"
-    RenderBR {BR} at (71,275) size 0x0
+    LayoutBR {BR} at (71,275) size 0x0
     RenderText {#text} at (0,280) size 71x19
       text run at (0,280) width 71: "Hello world"
-    RenderBR {BR} at (71,295) size 0x0
+    LayoutBR {BR} at (71,295) size 0x0
     RenderText {#text} at (0,300) size 71x19
       text run at (0,300) width 71: "Hello world"
-    RenderBR {BR} at (71,315) size 0x0
+    LayoutBR {BR} at (71,315) size 0x0
     RenderText {#text} at (0,320) size 71x19
       text run at (0,320) width 71: "Hello world"
-    RenderBR {BR} at (71,335) size 0x0
+    LayoutBR {BR} at (71,335) size 0x0
     RenderText {#text} at (0,340) size 71x19
       text run at (0,340) width 71: "Hello world"
-    RenderBR {BR} at (71,355) size 0x0
+    LayoutBR {BR} at (71,355) size 0x0
     RenderText {#text} at (0,360) size 71x19
       text run at (0,360) width 71: "Hello world"
-    RenderBR {BR} at (71,375) size 0x0
+    LayoutBR {BR} at (71,375) size 0x0
     RenderText {#text} at (0,380) size 71x19
       text run at (0,380) width 71: "Hello world"
-    RenderBR {BR} at (71,395) size 0x0
+    LayoutBR {BR} at (71,395) size 0x0
     RenderText {#text} at (0,400) size 71x19
       text run at (0,400) width 71: "Hello world"
-    RenderBR {BR} at (71,415) size 0x0
+    LayoutBR {BR} at (71,415) size 0x0
     RenderText {#text} at (0,420) size 71x19
       text run at (0,420) width 71: "Hello world"
-    RenderBR {BR} at (71,435) size 0x0
+    LayoutBR {BR} at (71,435) size 0x0
     RenderText {#text} at (0,440) size 71x19
       text run at (0,440) width 71: "Hello world"
-    RenderBR {BR} at (71,455) size 0x0
+    LayoutBR {BR} at (71,455) size 0x0
     RenderText {#text} at (0,460) size 71x19
       text run at (0,460) width 71: "Hello world"
-    RenderBR {BR} at (71,475) size 0x0
+    LayoutBR {BR} at (71,475) size 0x0
     RenderText {#text} at (0,480) size 71x19
       text run at (0,480) width 71: "Hello world"
-    RenderBR {BR} at (71,495) size 0x0
+    LayoutBR {BR} at (71,495) size 0x0
     RenderText {#text} at (0,500) size 71x19
       text run at (0,500) width 71: "Hello world"
-    RenderBR {BR} at (71,515) size 0x0
+    LayoutBR {BR} at (71,515) size 0x0
     RenderText {#text} at (0,520) size 71x19
       text run at (0,520) width 71: "Hello world"
-    RenderBR {BR} at (71,535) size 0x0
+    LayoutBR {BR} at (71,535) size 0x0
     RenderText {#text} at (0,540) size 71x19
       text run at (0,540) width 71: "Hello world"
-    RenderBR {BR} at (71,555) size 0x0
+    LayoutBR {BR} at (71,555) size 0x0
     RenderText {#text} at (0,560) size 71x19
       text run at (0,560) width 71: "Hello world"
-    RenderBR {BR} at (71,575) size 0x0
+    LayoutBR {BR} at (71,575) size 0x0
     RenderText {#text} at (0,580) size 71x19
       text run at (0,580) width 71: "Hello world"
-    RenderBR {BR} at (71,595) size 0x0
+    LayoutBR {BR} at (71,595) size 0x0
     RenderText {#text} at (0,600) size 71x19
       text run at (0,600) width 71: "Hello world"
-    RenderBR {BR} at (71,615) size 0x0
+    LayoutBR {BR} at (71,615) size 0x0
     RenderText {#text} at (0,620) size 71x19
       text run at (0,620) width 71: "Hello world"
-    RenderBR {BR} at (71,635) size 0x0
+    LayoutBR {BR} at (71,635) size 0x0
     RenderText {#text} at (0,640) size 71x19
       text run at (0,640) width 71: "Hello world"
-    RenderBR {BR} at (71,655) size 0x0
+    LayoutBR {BR} at (71,655) size 0x0
     RenderText {#text} at (0,660) size 71x19
       text run at (0,660) width 71: "Hello world"
-    RenderBR {BR} at (71,675) size 0x0
+    LayoutBR {BR} at (71,675) size 0x0
     RenderText {#text} at (0,680) size 71x19
       text run at (0,680) width 71: "Hello world"
-    RenderBR {BR} at (71,695) size 0x0
+    LayoutBR {BR} at (71,695) size 0x0
     RenderText {#text} at (0,700) size 71x19
       text run at (0,700) width 71: "Hello world"
-    RenderBR {BR} at (71,715) size 0x0
+    LayoutBR {BR} at (71,715) size 0x0
     RenderText {#text} at (0,720) size 71x19
       text run at (0,720) width 71: "Hello world"
-    RenderBR {BR} at (71,735) size 0x0
+    LayoutBR {BR} at (71,735) size 0x0
     RenderText {#text} at (0,740) size 71x19
       text run at (0,740) width 71: "Hello world"
-    RenderBR {BR} at (71,755) size 0x0
+    LayoutBR {BR} at (71,755) size 0x0
     RenderText {#text} at (0,760) size 71x19
       text run at (0,760) width 71: "Hello world"
-    RenderBR {BR} at (71,775) size 0x0
+    LayoutBR {BR} at (71,775) size 0x0
     RenderText {#text} at (0,780) size 71x19
       text run at (0,780) width 71: "Hello world"
-    RenderBR {BR} at (71,795) size 0x0
+    LayoutBR {BR} at (71,795) size 0x0
     RenderText {#text} at (0,800) size 71x19
       text run at (0,800) width 71: "Hello world"
-    RenderBR {BR} at (71,815) size 0x0
+    LayoutBR {BR} at (71,815) size 0x0
     RenderText {#text} at (0,820) size 71x19
       text run at (0,820) width 71: "Hello world"
-    RenderBR {BR} at (71,835) size 0x0
+    LayoutBR {BR} at (71,835) size 0x0
     RenderText {#text} at (0,840) size 71x19
       text run at (0,840) width 71: "Hello world"
-    RenderBR {BR} at (71,855) size 0x0
+    LayoutBR {BR} at (71,855) size 0x0
     RenderText {#text} at (0,860) size 71x19
       text run at (0,860) width 71: "Hello world"
-    RenderBR {BR} at (71,875) size 0x0
+    LayoutBR {BR} at (71,875) size 0x0
     RenderText {#text} at (0,880) size 71x19
       text run at (0,880) width 71: "Hello world"
-    RenderBR {BR} at (71,895) size 0x0
+    LayoutBR {BR} at (71,895) size 0x0
     RenderText {#text} at (0,900) size 71x19
       text run at (0,900) width 71: "Hello world"
-    RenderBR {BR} at (71,915) size 0x0
+    LayoutBR {BR} at (71,915) size 0x0
     RenderText {#text} at (0,920) size 71x19
       text run at (0,920) width 71: "Hello world"
-    RenderBR {BR} at (71,935) size 0x0
+    LayoutBR {BR} at (71,935) size 0x0