Move and rename RenderBR to LayoutBR.

LayoutTests/platform/android/svg/wicd/rightsizing-grid-expected.txt

 layer at (0,0) size 785x1449
   RenderView at (0,0) size 785x600
 layer at (0,0) size 785x1449
   RenderBlock {html} at (0,0) size 785x1449.14
     RenderBody {body} at (8,8) size 769x0
       RenderBlock (floating) {div} at (0,0) size 769x1441.14
         RenderBlock {h1} at (0,21.44) size 769x37
           RenderText {#text} at (0,0) size 443x36
             text run at (0,0) width 443: "SVG grid with percentage width"
         RenderBlock {h4} at (0,79.88) size 769x20
           RenderText {#text} at (0,0) size 146x19
             text run at (0,0) width 146: "WICD Core 1.0 #20-3"
         RenderBlock {p} at (0,121.14) size 769x0
           RenderBlock (floating) {div} at (256.30,128) size 256.30x448
-            RenderBR {br} at (256,0) size 1x19
+            LayoutBR {br} at (256,0) size 1x19
           RenderBlock (floating) {div} at (512.59,128) size 256.30x448
           RenderBlock (floating) {div} at (384.50,704) size 384.50x192
           RenderBlock (floating) {div} at (0,896) size 384.50x192
           RenderBlock (floating) {div} at (384.50,1024) size 384.50x128
         RenderBlock {p} at (0,121.14) size 769x596 [color=#FFFFFF]
-          RenderBR {br} at (769,0) size 0x19
+          LayoutBR {br} at (769,0) size 0x19
           RenderText {#text} at (640,576) size 9x19
             text run at (640,576) width 9: ".."
         RenderBlock {p} at (0,733.14) size 769x580
           RenderText {#text} at (640,0) size 760x579
             text run at (640,0) width 115: "Above, you should"
             text run at (640,20) width 95: "see a grid of 17"
             text run at (640,40) width 120: "SVG child elements"
             text run at (640,60) width 113: "sticked together to"
             text run at (0,540) width 148: "build one rectangle grid. "
             text run at (148,540) width 584: "You should be able to resize your browser window and the grid rendering should adjust to it. The"
@@ skipping 11 matching lines @@
           RenderInline {a} at (0,0) size 18x19 [color=#0000EE]
             RenderText {#text} at (432,560) size 18x19
               text run at (432,560) width 18: "big"
           RenderText {#text} at (450,560) size 4x19
             text run at (450,560) width 4: "."
         RenderBlock {p} at (0,1329.14) size 769x40
           RenderText {#text} at (0,0) size 755x39
             text run at (0,0) width 755: "The test is successful, if all SVG elements resize exacly dependend on the width of the browser window, but keep their aspect"
             text run at (0,20) width 553: "ratio and relative position. The complete grid should always show a perfect rectangle object."
         RenderBlock {p} at (0,1385.14) size 769x40
-          RenderBR {br} at (0,0) size 0x19
+          LayoutBR {br} at (0,0) size 0x19
           RenderInline {a} at (0,0) size 32x19 [color=#0000EE]
             RenderText {#text} at (0,20) size 32x19
               text run at (0,20) width 32: "Back"
 layer at (8,129) size 385x128
   LayoutEmbeddedObject {object} at (0,0) size 384.50x128
     layer at (0,0) size 385x128
       RenderView at (0,0) size 385x128
     layer at (0,0) size 385x128
       RenderSVGRoot {svg} at (0,0) size 385x128
         LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
@@ skipping 248 matching lines @@
     layer at (0,0) size 96x128
       RenderSVGRoot {svg} at (0,0) size 96x128
         LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
           LayoutSVGResourceLinearGradient {linearGradient} [id="surface"] [gradientUnits=objectBoundingBox] [start=(1,0)] [end=(1,1)]
             RenderSVGGradientStop {stop} [offset=0.00] [color=#FFFFFF]
             RenderSVGGradientStop {stop} [offset=1.00] [color=#FFEEAA]
         LayoutSVGRect {rect} at (0,0) size 96x128 [stroke={[type=SOLID] [color=#FFCC33] [stroke width=2.00]}] [fill={[type=LINEAR-GRADIENT] [id="surface"]}] [x=1.00] [y=1.00] [width=28.00] [height=38.00]
         LayoutSVGText {text} at (8,8) size 14x24 contains 1 chunk(s)
           LayoutSVGInlineText {#text} at (0,0) size 13x23
             chunk 1 (middle anchor) text run 1 at (8.75,27.00) startOffset 0 endOffset 1 width 12.50: "T"