Move and rename RenderBR to LayoutBR.

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

Index: LayoutTests/platform/win/svg/wicd/test-rightsizing-b-expected.txt
diff --git a/LayoutTests/platform/win/svg/wicd/test-rightsizing-b-expected.txt b/LayoutTests/platform/win/svg/wicd/test-rightsizing-b-expected.txt
index 48570aeb48252d9e8542d22497cd736a43ece05d..e11148c37aa77a8945338f292881663554fedd25 100644
--- a/LayoutTests/platform/win/svg/wicd/test-rightsizing-b-expected.txt
+++ b/LayoutTests/platform/win/svg/wicd/test-rightsizing-b-expected.txt
@@ -22,8 +22,8 @@ layer at (0,0) size 785x854 backgroundClip at (0,0) size 785x600 clip at (0,0) s
           RenderText {#text} at (0,0) size 651x34
             text run at (0,0) width 651: "Above there must be four times the same, square SVG child visible, each referenced by an object element"
             text run at (0,17) width 414: "with different widths (40%, 20%, 10%, 5%) and no height defined. "
-          RenderBR {br} at (0,0) size 0x0
-          RenderBR {br} at (0,34) size 0x17
+          LayoutBR {br} at (0,0) size 0x0
+          LayoutBR {br} at (0,34) size 0x17
           RenderText {#text} at (0,51) size 398x17
             text run at (0,51) width 398: "Beyond there is the same, only with PNG images instead of SVG."
         RenderBlock (anonymous) at (0,439.77) size 737.89x299
@@ -43,7 +43,7 @@ layer at (0,0) size 785x854 backgroundClip at (0,0) size 785x600 clip at (0,0) s
             text run at (0,0) width 661: "This test has succeeded, if both rows look exactly the same (SVGs must be square!) and no red background"
             text run at (0,17) width 94: "color is visible."
         RenderBlock {p} at (0,781.39) size 678.86x34
-          RenderBR {br} at (0,0) size 0x17
+          LayoutBR {br} at (0,0) size 0x17
           RenderInline {a} at (0,0) size 31x17 [color=#000066]
             RenderText {#text} at (0,17) size 31x17
               text run at (0,17) width 31: "Back"