Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/fast/forms/select-initial-position-expected.txt

Index: LayoutTests/platform/mac/fast/forms/select-initial-position-expected.txt
diff --git a/LayoutTests/platform/mac/fast/forms/select-initial-position-expected.txt b/LayoutTests/platform/mac/fast/forms/select-initial-position-expected.txt
index 944cdabfc66bf35a315a52bcc45499ea8dd19b60..3de2158e6ef8cf6c481c3da07789e0d3af10cade 100644
--- a/LayoutTests/platform/mac/fast/forms/select-initial-position-expected.txt
+++ b/LayoutTests/platform/mac/fast/forms/select-initial-position-expected.txt
@@ -5,36 +5,36 @@ layer at (0,0) size 800x600
     RenderBody {BODY} at (8,8) size 784x584
       RenderText {#text} at (0,0) size 98x18
         text run at (0,0) width 98: "initial selected:"
-      RenderBR {BR} at (97,14) size 1x0
+      LayoutBR {BR} at (97,14) size 1x0
       RenderText {#text} at (140,58) size 5x18
         text run at (140,58) width 5: " "
-      RenderBR {BR} at (144,72) size 1x0
+      LayoutBR {BR} at (144,72) size 1x0
       RenderText {#text} at (0,76) size 165x18
         text run at (0,76) width 165: "dynamic selected change:"
-      RenderBR {BR} at (164,90) size 1x0
+      LayoutBR {BR} at (164,90) size 1x0
       RenderText {#text} at (140,134) size 5x18
         text run at (140,134) width 5: " "
       RenderText {#text} at (0,0) size 0x0
-      RenderBR {BR} at (0,0) size 0x0
+      LayoutBR {BR} at (0,0) size 0x0
       RenderText {#text} at (0,152) size 217x18
         text run at (0,152) width 217: "dynamic insert of selected option:"
-      RenderBR {BR} at (216,166) size 1x0
+      LayoutBR {BR} at (216,166) size 1x0
       RenderText {#text} at (140,210) size 5x18
         text run at (140,210) width 5: " "
-      RenderBR {BR} at (144,224) size 1x0
+      LayoutBR {BR} at (144,224) size 1x0
       RenderText {#text} at (0,228) size 98x18
         text run at (0,228) width 98: "initial selected:"
-      RenderBR {BR} at (97,242) size 1x0
+      LayoutBR {BR} at (97,242) size 1x0
       RenderMenuList {SELECT} at (0,247) size 155x18 [bgcolor=#F8F8F8]
         RenderBlock (anonymous) at (0,0) size 155x18
           RenderText at (8,2) size 124x13
             text run at (8,2) width 124: "this should be selected"
       RenderText {#text} at (155,246) size 4x18
         text run at (155,246) width 4: " "
-      RenderBR {BR} at (159,260) size 0x0
+      LayoutBR {BR} at (159,260) size 0x0
       RenderText {#text} at (0,265) size 165x18
         text run at (0,265) width 165: "dynamic selected change:"
-      RenderBR {BR} at (164,279) size 1x0
+      LayoutBR {BR} at (164,279) size 1x0
       RenderMenuList {SELECT} at (0,284) size 155x18 [bgcolor=#F8F8F8]
         RenderBlock (anonymous) at (0,0) size 155x18
           RenderText at (8,2) size 124x13
@@ -42,10 +42,10 @@ layer at (0,0) size 800x600
       RenderText {#text} at (155,283) size 4x18
         text run at (155,283) width 4: " "
       RenderText {#text} at (0,0) size 0x0
-      RenderBR {BR} at (0,0) size 0x0
+      LayoutBR {BR} at (0,0) size 0x0
       RenderText {#text} at (0,302) size 217x18
         text run at (0,302) width 217: "dynamic insert of selected option:"
-      RenderBR {BR} at (216,316) size 1x0
+      LayoutBR {BR} at (216,316) size 1x0
       RenderMenuList {SELECT} at (0,320) size 155x18 [bgcolor=#F8F8F8]
         RenderBlock (anonymous) at (0,0) size 155x18
           RenderText at (8,2) size 124x13