Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/fast/forms/input-baseline-expected.txt

Index: LayoutTests/platform/linux/fast/forms/input-baseline-expected.txt
diff --git a/LayoutTests/platform/linux/fast/forms/input-baseline-expected.txt b/LayoutTests/platform/linux/fast/forms/input-baseline-expected.txt
index 5161154e912a6bcc9bb19014d065aeb5679f7414..b79e26561b83dc31592c874ab3e061474ac0c308 100644
--- a/LayoutTests/platform/linux/fast/forms/input-baseline-expected.txt
+++ b/LayoutTests/platform/linux/fast/forms/input-baseline-expected.txt
@@ -5,13 +5,13 @@ layer at (0,0) size 800x600
     RenderBody {BODY} at (8,8) size 784x584
       RenderText {#text} at (0,0) size 277x19
         text run at (0,0) width 277: "This tests that text fields get the right baseline. "
-      RenderBR {BR} at (277,15) size 0x0
-      RenderBR {BR} at (0,20) size 0x19
+      LayoutBR {BR} at (277,15) size 0x0
+      LayoutBR {BR} at (0,20) size 0x19
       LayoutTextControl {INPUT} at (0,40) size 154x22 [bgcolor=#FFFFFF] [border: (2px inset #EEEEEE)]
       RenderText {#text} at (154,41) size 398x19
         text run at (154,41) width 398: "This text should line up with the bottom of the text in the text field. "
-      RenderBR {BR} at (552,56) size 0x0
-      RenderBR {BR} at (0,62) size 0x19
+      LayoutBR {BR} at (552,56) size 0x0
+      LayoutBR {BR} at (0,62) size 0x19
       LayoutTextControl {INPUT} at (0,82) size 154x128 [bgcolor=#FFFFFF] [border: (2px inset #EEEEEE)]
       RenderText {#text} at (154,167) size 394x19
         text run at (154,167) width 394: "This text should line up with the bottom of the text in the text field."