Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/css1/box_properties/clear-expected.txt

Index: LayoutTests/platform/linux/css1/box_properties/clear-expected.txt
diff --git a/LayoutTests/platform/linux/css1/box_properties/clear-expected.txt b/LayoutTests/platform/linux/css1/box_properties/clear-expected.txt
index a50947496cadc3a5eca5ca5e95695765bda10f2d..6f215f3fed9fbe9defe12cb91a681afdf4434f03 100644
--- a/LayoutTests/platform/linux/css1/box_properties/clear-expected.txt
+++ b/LayoutTests/platform/linux/css1/box_properties/clear-expected.txt
@@ -22,19 +22,19 @@ layer at (0,0) size 785x1005 backgroundClip at (0,0) size 785x600 clip at (0,0)
         RenderText {#text} at (18,0) size 563x19
           text run at (18,0) width 563: "This text should be flowing past a tall orange rectangle on the left side of the browser window."
       RenderBlock (anonymous) at (0,167) size 769x20
-        RenderBR {BR} at (18,0) size 0x19
+        LayoutBR {BR} at (18,0) size 0x19
         LayoutImage {IMG} at (0,20) size 15x50
       RenderBlock {P} at (0,237) size 769x20
         RenderText {#text} at (0,0) size 620x19
           text run at (0,0) width 620: "This paragraph should appear below the tall orange rectangle above and to the left, and not flow past it."
       RenderBlock (anonymous) at (0,273) size 769x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
         LayoutImage {IMG} at (754,20) size 15x50
       RenderBlock {P} at (0,343) size 769x20
         RenderText {#text} at (0,0) size 628x19
           text run at (0,0) width 628: "This paragraph should appear below the tall orange rectangle above and to the right, and not flow past it."
       RenderBlock (anonymous) at (0,379) size 769x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
         LayoutImage {IMG} at (0,20) size 15x50
         LayoutImage {IMG} at (754,20) size 15x50
       RenderBlock {P} at (0,449) size 769x20
@@ -46,7 +46,7 @@ layer at (0,0) size 785x1005 backgroundClip at (0,0) size 785x600 clip at (0,0)
         RenderText {#text} at (18,0) size 372x19
           text run at (18,0) width 372: "This paragraph should be between both tall orange rectangles."
       RenderBlock (anonymous) at (0,521) size 769x20
-        RenderBR {BR} at (18,0) size 0x19
+        LayoutBR {BR} at (18,0) size 0x19
       LayoutTable {TABLE} at (0,541) size 650x448 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 648x446
           LayoutTableRow {TR} at (0,0) size 648x28
@@ -64,19 +64,19 @@ layer at (0,0) size 785x1005 backgroundClip at (0,0) size 785x600 clip at (0,0)
                 RenderText {#text} at (18,0) size 563x19
                   text run at (18,0) width 563: "This text should be flowing past a tall orange rectangle on the left side of the browser window."
               RenderBlock (anonymous) at (4,40) size 628x20
-                RenderBR {BR} at (18,0) size 0x19
+                LayoutBR {BR} at (18,0) size 0x19
                 LayoutImage {IMG} at (0,20) size 15x50
               RenderBlock {P} at (4,110) size 628x20
                 RenderText {#text} at (0,0) size 620x19
                   text run at (0,0) width 620: "This paragraph should appear below the tall orange rectangle above and to the left, and not flow past it."
               RenderBlock (anonymous) at (4,146) size 628x20
-                RenderBR {BR} at (0,0) size 0x19
+                LayoutBR {BR} at (0,0) size 0x19
                 LayoutImage {IMG} at (613,20) size 15x50
               RenderBlock {P} at (4,216) size 628x20
                 RenderText {#text} at (0,0) size 628x19
                   text run at (0,0) width 628: "This paragraph should appear below the tall orange rectangle above and to the right, and not flow past it."
               RenderBlock (anonymous) at (4,252) size 628x20
-                RenderBR {BR} at (0,0) size 0x19
+                LayoutBR {BR} at (0,0) size 0x19
                 LayoutImage {IMG} at (0,20) size 15x50
                 LayoutImage {IMG} at (613,20) size 15x50
               RenderBlock {P} at (4,322) size 628x20
@@ -88,4 +88,4 @@ layer at (0,0) size 785x1005 backgroundClip at (0,0) size 785x600 clip at (0,0)
                 RenderText {#text} at (18,0) size 372x19
                   text run at (18,0) width 372: "This paragraph should be between both tall orange rectangles."
               RenderBlock (anonymous) at (4,394) size 628x20
-                RenderBR {BR} at (18,0) size 0x19
+                LayoutBR {BR} at (18,0) size 0x19