Move and rename RenderBR to LayoutBR.

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

Index: LayoutTests/platform/mac/fast/forms/input-baseline-expected.txt
diff --git a/LayoutTests/platform/mac/fast/forms/input-baseline-expected.txt b/LayoutTests/platform/mac/fast/forms/input-baseline-expected.txt
index 4dddbdfbb869593e05ca24fedfd9754ccc8ce1f6..0b8938e1d72b40ddda4c9451c300b3175371924f 100644
--- a/LayoutTests/platform/mac/fast/forms/input-baseline-expected.txt
+++ b/LayoutTests/platform/mac/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 303x18
         text run at (0,0) width 303: "This tests that text fields get the right baseline. "
-      RenderBR {BR} at (302,14) size 1x0
-      RenderBR {BR} at (0,18) size 0x18
+      LayoutBR {BR} at (302,14) size 1x0
+      LayoutBR {BR} at (0,18) size 0x18
       LayoutTextControl {INPUT} at (0,36) size 123x19 [bgcolor=#FFFFFF] [border: (2px inset #EEEEEE)]
       RenderText {#text} at (123,36) size 435x18
         text run at (123,36) width 435: "This text should line up with the bottom of the text in the text field. "
-      RenderBR {BR} at (557,50) size 1x0
-      RenderBR {BR} at (0,55) size 0x18
+      LayoutBR {BR} at (557,50) size 1x0
+      LayoutBR {BR} at (0,55) size 0x18
       LayoutTextControl {INPUT} at (0,73) size 123x131 [bgcolor=#FFFFFF] [border: (2px inset #EEEEEE)]
       RenderText {#text} at (123,165) size 431x18
         text run at (123,165) width 431: "This text should line up with the bottom of the text in the text field."