Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/fast/forms/textAreaLineHeight-expected.txt

Index: LayoutTests/platform/mac/fast/forms/textAreaLineHeight-expected.txt
diff --git a/LayoutTests/platform/mac/fast/forms/textAreaLineHeight-expected.txt b/LayoutTests/platform/mac/fast/forms/textAreaLineHeight-expected.txt
index 007c142f4f59142a8ad7f6972410fa698331a95b..d6edfbf16edc4afba6675f22816cb219be0b140f 100644
--- a/LayoutTests/platform/mac/fast/forms/textAreaLineHeight-expected.txt
+++ b/LayoutTests/platform/mac/fast/forms/textAreaLineHeight-expected.txt
@@ -6,15 +6,15 @@ layer at (0,0) size 785x1199 backgroundClip at (0,0) size 785x600 clip at (0,0)
       RenderBlock (anonymous) at (0,0) size 769x18
         RenderText {#text} at (0,0) size 278x18
           text run at (0,0) width 278: "line-height settings not reflected in textarea"
-        RenderBR {BR} at (277,0) size 1x18
+        LayoutBR {BR} at (277,0) size 1x18
       RenderBlock {P} at (0,34) size 769x264
         RenderText {#text} at (0,0) size 85x18
           text run at (0,0) width 85: "TEXTAREA"
-        RenderBR {BR} at (84,0) size 1x18
+        LayoutBR {BR} at (84,0) size 1x18
         RenderText {#text} at (406,210) size 4x18
           text run at (406,210) width 4: " "
-        RenderBR {BR} at (0,0) size 0x0
-        RenderBR {BR} at (0,228) size 0x18
+        LayoutBR {BR} at (0,0) size 0x0
+        LayoutBR {BR} at (0,228) size 0x18
         RenderText {#text} at (0,246) size 150x18
           text run at (0,246) width 150: "PARAGRAPH - works"
       RenderBlock {P} at (0,314) size 402x202 [border: (1px dotted #C0C0C0)]
@@ -22,34 +22,34 @@ layer at (0,0) size 785x1199 backgroundClip at (0,0) size 785x600 clip at (0,0)
           text run at (1,19) width 384: "Demo text here that wraps a bit and should demonstrate"
           text run at (1,72) width 184: "the goodness of line-height"
       RenderBlock (anonymous) at (0,529.33) size 769x36
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
         RenderText {#text} at (0,18) size 81x18
           text run at (0,18) width 81: "DIV - works"
-        RenderBR {BR} at (80,18) size 1x18
+        LayoutBR {BR} at (80,18) size 1x18
       RenderBlock {DIV} at (0,565.33) size 402x202 [border: (1px dotted #C0C0C0)]
         RenderText {#text} at (1,19) size 384x69
           text run at (1,19) width 384: "Demo text here that wraps a bit and should demonstrate"
           text run at (1,72) width 184: "the goodness of line-height"
       RenderBlock (anonymous) at (0,767.33) size 769x408
-        RenderBR {BR} at (0,0) size 0x18
-        RenderBR {BR} at (0,18) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,18) size 0x18
         RenderText {#text} at (0,36) size 126x18
           text run at (0,36) width 126: "Un-Styled Textarea"
-        RenderBR {BR} at (125,36) size 1x18
+        LayoutBR {BR} at (125,36) size 1x18
         RenderText {#text} at (161,72) size 4x18
           text run at (161,72) width 4: " "
-        RenderBR {BR} at (0,0) size 0x0
-        RenderBR {BR} at (0,90) size 0x18
+        LayoutBR {BR} at (0,0) size 0x0
+        LayoutBR {BR} at (0,90) size 0x18
         RenderText {#text} at (0,108) size 219x18
           text run at (0,108) width 219: "Totally Blank Un-Styled Textarea"
-        RenderBR {BR} at (218,108) size 1x18
+        LayoutBR {BR} at (218,108) size 1x18
         RenderText {#text} at (161,144) size 4x18
           text run at (161,144) width 4: " "
-        RenderBR {BR} at (0,0) size 0x0
-        RenderBR {BR} at (0,162) size 0x18
+        LayoutBR {BR} at (0,0) size 0x0
+        LayoutBR {BR} at (0,162) size 0x18
         RenderText {#text} at (0,180) size 214x18
           text run at (0,180) width 214: "Totally Blank STYLED Textarea"
-        RenderBR {BR} at (213,180) size 1x18
+        LayoutBR {BR} at (213,180) size 1x18
         RenderText {#text} at (0,0) size 0x0
       RenderBlock {P} at (0,1191.33) size 769x0
 layer at (8,60) size 406x206 clip at (9,61) size 404x204