Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/fast/forms/disabled-select-change-index-expected.txt

Index: LayoutTests/platform/linux/fast/forms/disabled-select-change-index-expected.txt
diff --git a/LayoutTests/platform/linux/fast/forms/disabled-select-change-index-expected.txt b/LayoutTests/platform/linux/fast/forms/disabled-select-change-index-expected.txt
index 498df4a6a3144cde15305a23fefda66a2fd913a5..0d79cc12052e513d7463913a663a55aa891bcb7c 100644
--- a/LayoutTests/platform/linux/fast/forms/disabled-select-change-index-expected.txt
+++ b/LayoutTests/platform/linux/fast/forms/disabled-select-change-index-expected.txt
@@ -7,50 +7,50 @@ layer at (0,0) size 800x600
         RenderBlock (anonymous) at (1,1) size 59x18
           RenderText at (4,1) size 36x16
             text run at (4,1) width 36: "PASS"
-      RenderBR {BR} at (61,15) size 0x0
+      LayoutBR {BR} at (61,15) size 0x0
       RenderMenuList {SELECT} at (0,20) size 61x20 [color=#808080] [bgcolor=#C0C0C0] [border: (1px solid #A9A9A9)]
         RenderBlock (anonymous) at (1,1) size 59x18
           RenderText at (4,1) size 36x16
             text run at (4,1) width 36: "PASS"
-      RenderBR {BR} at (61,35) size 0x0
+      LayoutBR {BR} at (61,35) size 0x0
       RenderMenuList {SELECT} at (0,40) size 61x20 [bgcolor=#C0C0C0] [border: (1px solid #A9A9A9)]
         RenderBlock (anonymous) at (1,1) size 59x18
           RenderText at (4,1) size 36x16
             text run at (4,1) width 36: "PASS"
-      RenderBR {BR} at (61,55) size 0x0
+      LayoutBR {BR} at (61,55) size 0x0
       RenderMenuList {SELECT} at (0,60) size 61x20 [bgcolor=#C0C0C0] [border: (1px solid #A9A9A9)]
         RenderBlock (anonymous) at (1,1) size 59x18
           RenderText at (4,1) size 36x16
             text run at (4,1) width 36: "PASS"
-      RenderBR {BR} at (61,75) size 0x0
-      RenderBR {BR} at (57,112) size 0x0
-      RenderBR {BR} at (57,148) size 0x0
-      RenderBR {BR} at (57,184) size 0x0
-      RenderBR {BR} at (57,220) size 0x0
+      LayoutBR {BR} at (61,75) size 0x0
+      LayoutBR {BR} at (57,112) size 0x0
+      LayoutBR {BR} at (57,148) size 0x0
+      LayoutBR {BR} at (57,184) size 0x0
+      LayoutBR {BR} at (57,220) size 0x0
       RenderText {#text} at (0,224) size 472x19
         text run at (0,224) width 472: "PASS: sel1 correctly set to selectedIndex 1 by sel1.options[1].selected = true."
-      RenderBR {BR} at (472,239) size 0x0
+      LayoutBR {BR} at (472,239) size 0x0
       RenderText {#text} at (0,244) size 425x19
         text run at (0,244) width 425: "PASS: sel2 correctly set to selectedIndex 1 by sel2.selectedIndex = 1."
-      RenderBR {BR} at (425,259) size 0x0
+      LayoutBR {BR} at (425,259) size 0x0
       RenderText {#text} at (0,264) size 472x19
         text run at (0,264) width 472: "PASS: sel3 correctly set to selectedIndex 1 by sel3.options[1].selected = true."
-      RenderBR {BR} at (472,279) size 0x0
+      LayoutBR {BR} at (472,279) size 0x0
       RenderText {#text} at (0,284) size 425x19
         text run at (0,284) width 425: "PASS: sel4 correctly set to selectedIndex 1 by sel4.selectedIndex = 1."
-      RenderBR {BR} at (425,299) size 0x0
+      LayoutBR {BR} at (425,299) size 0x0
       RenderText {#text} at (0,304) size 472x19
         text run at (0,304) width 472: "PASS: sel5 correctly set to selectedIndex 1 by sel5.options[1].selected = true."
-      RenderBR {BR} at (472,319) size 0x0
+      LayoutBR {BR} at (472,319) size 0x0
       RenderText {#text} at (0,324) size 425x19
         text run at (0,324) width 425: "PASS: sel6 correctly set to selectedIndex 1 by sel6.selectedIndex = 1."
-      RenderBR {BR} at (425,339) size 0x0
+      LayoutBR {BR} at (425,339) size 0x0
       RenderText {#text} at (0,344) size 472x19
         text run at (0,344) width 472: "PASS: sel7 correctly set to selectedIndex 1 by sel7.options[1].selected = true."
-      RenderBR {BR} at (472,359) size 0x0
+      LayoutBR {BR} at (472,359) size 0x0
       RenderText {#text} at (0,364) size 425x19
         text run at (0,364) width 425: "PASS: sel8 correctly set to selectedIndex 1 by sel8.selectedIndex = 1."
-      RenderBR {BR} at (425,379) size 0x0
+      LayoutBR {BR} at (425,379) size 0x0
 layer at (8,88) size 57x36 clip at (9,89) size 40x34
   RenderListBox {SELECT} at (0,80) size 57x36 [color=#808080] [bgcolor=#FFFFFF] [border: (1px solid #A9A9A9)]
     RenderBlock {OPTION} at (1,1) size 40x17