Move and rename RenderBR to LayoutBR.

LayoutTests/platform/win/fast/forms/textarea-width-expected.txt

Index: LayoutTests/platform/win/fast/forms/textarea-width-expected.txt
diff --git a/LayoutTests/platform/win/fast/forms/textarea-width-expected.txt b/LayoutTests/platform/win/fast/forms/textarea-width-expected.txt
index bd092bec5416c1378a0a7ddd84b9f8648f33dcd8..d7bc3105d5170ee57fae9b928d6f9f5b2dc88044 100644
--- a/LayoutTests/platform/win/fast/forms/textarea-width-expected.txt
+++ b/LayoutTests/platform/win/fast/forms/textarea-width-expected.txt
@@ -8,7 +8,7 @@ layer at (0,0) size 800x600
           text run at (0,0) width 753: "This text area should be drawn with a reasonable width. To match IE, using GDI fonts it should wrap at 66 characters"
           text run at (0,18) width 581: "(after the X in the third set of digits). See https://bugs.webkit.org/show_bug.cgi?id=15312."
       RenderBlock (anonymous) at (0,36) size 784x262
-        RenderBR {BR} at (0,0) size 0x17
+        LayoutBR {BR} at (0,0) size 0x17
         RenderText {#text} at (0,0) size 0x0
 layer at (8,62) size 635x244 clip at (9,63) size 633x242
   LayoutTextControl {TEXTAREA} at (0,18) size 635x244 [color=#333333] [bgcolor=#FFFFFF] [border: (1px solid #A9A9A9)]
@@ -16,5 +16,5 @@ layer at (8,62) size 635x244 clip at (9,63) size 633x242
       RenderText {#text} at (0,0) size 626x24
         text run at (0,0) width 626: "1234567890abcdefghijABCDEFGHIJ1234567890abcdefghijABCDEFGHIJ12345X7890abcdefghijABCDEFGXIJ123456"
         text run at (0,12) width 153: "7890abcdefghijABCDEFGHIJ"
-      RenderBR {BR} at (153,22) size 0x0
-      RenderBR {BR} at (0,24) size 0x12
+      LayoutBR {BR} at (153,22) size 0x0
+      LayoutBR {BR} at (0,24) size 0x12