Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/fast/text/basic/014-expected.txt

Index: LayoutTests/platform/linux/fast/text/basic/014-expected.txt
diff --git a/LayoutTests/platform/linux/fast/text/basic/014-expected.txt b/LayoutTests/platform/linux/fast/text/basic/014-expected.txt
index 6746fb5edce2b8e96313b9156e67253b936310fc..b57bfd14422e666a3f3913bbf3539a5fad0139ed 100644
--- a/LayoutTests/platform/linux/fast/text/basic/014-expected.txt
+++ b/LayoutTests/platform/linux/fast/text/basic/014-expected.txt
@@ -16,7 +16,7 @@ layer at (0,0) size 800x600
           RenderText {#text} at (0,0) size 378x39
             text run at (0,0) width 378: "I\x{2019}m told this is the longest word in the English language: anti\x{AD}dis\x{AD}" + hyphen string "-"
             text run at (0,20) width 32: "est\x{AD}ab\x{AD}"
-          RenderBR {BR} at (32,35) size 0x0
+          LayoutBR {BR} at (32,35) size 0x0
           RenderText {#text} at (0,40) size 101x19
             text run at (0,40) width 101: "lish\x{AD}ment\x{AD}arian\x{AD}ism."
       RenderBlock {P} at (0,224) size 784x0
@@ -30,6 +30,6 @@ layer at (0,0) size 800x600
         RenderBlock {P} at (2,90) size 505x40
           RenderText {#text} at (0,0) size 404x19
             text run at (0,0) width 404: "I\x{2019}m told this is the longest word in the English language: anti\x{AD}dis\x{AD}est\x{AD}ab\x{AD}"
-          RenderBR {BR} at (404,15) size 0x0
+          LayoutBR {BR} at (404,15) size 0x0
           RenderText {#text} at (0,20) size 101x19
             text run at (0,20) width 101: "lish\x{AD}ment\x{AD}arian\x{AD}ism."