Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/svg/wicd/test-rightsizing-b-expected.txt

Index: LayoutTests/platform/mac/svg/wicd/test-rightsizing-b-expected.txt
diff --git a/LayoutTests/platform/mac/svg/wicd/test-rightsizing-b-expected.txt b/LayoutTests/platform/mac/svg/wicd/test-rightsizing-b-expected.txt
index 5c20c8910dfabd618f24fffeb68a1697148d06ba..0ab072792c3cf8219eaeadd874a07f8b20abe056 100644
--- a/LayoutTests/platform/mac/svg/wicd/test-rightsizing-b-expected.txt
+++ b/LayoutTests/platform/mac/svg/wicd/test-rightsizing-b-expected.txt
@@ -22,8 +22,8 @@ layer at (0,0) size 785x846 backgroundClip at (0,0) size 785x600 clip at (0,0) s
           RenderText {#text} at (0,0) size 663x32
             text run at (0,0) width 663: "Above there must be four times the same, square SVG child visible, each referenced by an object element"
             text run at (0,16) width 423: "with different widths (40%, 20%, 10%, 5%) and no height defined. "
-          RenderBR {br} at (0,0) size 0x0
-          RenderBR {br} at (0,32) size 0x16
+          LayoutBR {br} at (0,0) size 0x0
+          LayoutBR {br} at (0,32) size 0x16
           RenderText {#text} at (0,48) size 409x16
             text run at (0,48) width 409: "Beyond there is the same, only with PNG images instead of SVG."
         RenderBlock (anonymous) at (0,435.77) size 737.89x299
@@ -43,7 +43,7 @@ layer at (0,0) size 785x846 backgroundClip at (0,0) size 785x600 clip at (0,0) s
             text run at (0,0) width 675: "This test has succeeded, if both rows look exactly the same (SVGs must be square!) and no red background"
             text run at (0,16) width 95: "color is visible."
         RenderBlock {p} at (0,775.39) size 678.86x32
-          RenderBR {br} at (0,0) size 0x16
+          LayoutBR {br} at (0,0) size 0x16
           RenderInline {a} at (0,0) size 31x16 [color=#000066]
             RenderText {#text} at (0,16) size 31x16
               text run at (0,16) width 31: "Back"