Move and rename RenderBR to LayoutBR.

LayoutTests/platform/win-xp/fast/block/float/021-expected.txt

Index: LayoutTests/platform/win-xp/fast/block/float/021-expected.txt
diff --git a/LayoutTests/platform/win-xp/fast/block/float/021-expected.txt b/LayoutTests/platform/win-xp/fast/block/float/021-expected.txt
index fb9de93070f30adf66f5f814f96faa238f3f4b39..a6d9d59028e12ada25903370f2779fdffd39d1c6 100644
--- a/LayoutTests/platform/win-xp/fast/block/float/021-expected.txt
+++ b/LayoutTests/platform/win-xp/fast/block/float/021-expected.txt
@@ -11,7 +11,7 @@ layer at (0,0) size 785x3172 backgroundClip at (0,0) size 785x585 clip at (0,0)
       RenderBlock {DIV} at (0,56) size 720x240 [border: (10px solid #000000)]
         RenderText {#text} at (10,10) size 294x19
           text run at (10,10) width 294: "You should see blue and green rectangles below."
-        RenderBR {BR} at (304,25) size 0x0
+        LayoutBR {BR} at (304,25) size 0x0
         RenderBlock (floating) {DIV} at (10,30) size 1500x100 [bgcolor=#0000FF]
         RenderText {#text} at (0,0) size 0x0
         RenderBlock (floating) {DIV} at (10,130) size 1500x100 [bgcolor=#008000]
@@ -27,7 +27,7 @@ layer at (0,0) size 785x3172 backgroundClip at (0,0) size 785x585 clip at (0,0)
       RenderBlock {DIV} at (0,568) size 720x240 [border: (10px solid #000000)]
         RenderBlock (floating) {DIV} at (10,10) size 1500x100 [bgcolor=#0000FF]
         RenderBlock (floating) {DIV} at (10,110) size 1500x100 [bgcolor=#008000]
-        RenderBR {BR} at (1510,10) size 0x19
+        LayoutBR {BR} at (1510,10) size 0x19
         RenderText {#text} at (10,210) size 294x19
           text run at (10,210) width 294: "You should see blue and green rectangles above."
       RenderBlock {DIV} at (0,824) size 720x240 [border: (10px solid #000000)]
@@ -45,7 +45,7 @@ layer at (0,0) size 785x3172 backgroundClip at (0,0) size 785x585 clip at (0,0)
         RenderBlock (floating) {DIV} at (10,10) size 1500x100 [bgcolor=#0000FF]
         RenderText {#text} at (10,110) size 271x19
           text run at (10,110) width 271: "You should see blue above and green below."
-        RenderBR {BR} at (281,125) size 0x0
+        LayoutBR {BR} at (281,125) size 0x0
         RenderBlock (floating) {DIV} at (10,130) size 1500x100 [bgcolor=#008000]
         RenderText {#text} at (0,0) size 0x0
       RenderBlock (anonymous) at (0,1592) size 769x20
@@ -54,7 +54,7 @@ layer at (0,0) size 785x3172 backgroundClip at (0,0) size 785x585 clip at (0,0)
       RenderBlock {DIV} at (0,1628) size 720x240 [border: (10px solid #000000)]
         RenderText {#text} at (10,10) size 294x19
           text run at (10,10) width 294: "You should see blue and green rectangles below."
-        RenderBR {BR} at (304,25) size 0x0
+        LayoutBR {BR} at (304,25) size 0x0
         RenderBlock (floating) {DIV} at (10,30) size 698x100 [bgcolor=#0000FF]
         RenderText {#text} at (0,0) size 0x0
         RenderBlock (floating) {DIV} at (10,130) size 698x100 [bgcolor=#008000]
@@ -69,7 +69,7 @@ layer at (0,0) size 785x3172 backgroundClip at (0,0) size 785x585 clip at (0,0)
       RenderBlock {DIV} at (0,2140) size 720x240 [border: (10px solid #000000)]
         RenderBlock (floating) {DIV} at (10,10) size 698x100 [bgcolor=#0000FF]
         RenderBlock (floating) {DIV} at (10,110) size 698x100 [bgcolor=#008000]
-        RenderBR {BR} at (708,10) size 0x19
+        LayoutBR {BR} at (708,10) size 0x19
         RenderText {#text} at (10,210) size 294x19
           text run at (10,210) width 294: "You should see blue and green rectangles above."
       RenderBlock {DIV} at (0,2396) size 720x240 [border: (10px solid #000000)]
@@ -87,6 +87,6 @@ layer at (0,0) size 785x3172 backgroundClip at (0,0) size 785x585 clip at (0,0)
         RenderBlock (floating) {DIV} at (10,10) size 698x100 [bgcolor=#0000FF]
         RenderText {#text} at (10,110) size 271x19
           text run at (10,110) width 271: "You should see blue above and green below."
-        RenderBR {BR} at (281,125) size 0x0
+        LayoutBR {BR} at (281,125) size 0x0
         RenderBlock (floating) {DIV} at (10,130) size 698x100 [bgcolor=#008000]
         RenderText {#text} at (0,0) size 0x0