Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/tables/mozilla/bugs/bug32205-2-expected.txt

 layer at (0,0) size 800x600 clip at (0,0) size 785x600 scrollHeight 1299
   RenderView at (0,0) size 800x600
 layer at (0,0) size 785x1299 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600 outlineClip at (0,0) size 785x600
   RenderBlock {HTML} at (0,0) size 785x1299
     RenderBody {BODY} at (8,8) size 769x1283 [bgcolor=#FFFFFF]
       RenderBlock {P} at (0,0) size 769x18
         RenderText {#text} at (0,0) size 477x18
           text run at (0,0) width 477: "This is a simple example of table height problems with only a single table."
       RenderBlock {P} at (0,34) size 769x54
         RenderText {#text} at (0,0) size 745x54
@@ skipping 22 matching lines @@
         RenderText {#text} at (0,0) size 520x18
           text run at (0,0) width 483: "This following table ought to give the desired results (small title line, large "
           text run at (482,0) width 38: "body)"
       RenderBlock {P} at (0,226) size 769x18
         RenderText {#text} at (0,0) size 116x18
           text run at (0,0) width 116: "It is specifiable as"
       RenderBlock {BLOCKQUOTE} at (40,260) size 689x54
         RenderBlock {P} at (0,0) size 689x54
           RenderText {#text} at (0,0) size 117x18
             text run at (0,0) width 117: "Table height: 200 "
-          RenderBR {BR} at (116,14) size 1x0
+          LayoutBR {BR} at (116,14) size 1x0
           RenderText {#text} at (0,18) size 131x18
             text run at (0,18) width 131: "First Row : 1 or 1% "
           RenderInline {I} at (0,0) size 221x18
             RenderText {#text} at (130,18) size 221x18
               text run at (130,18) width 221: "(i.e. expand to minimum required)"
-          RenderBR {BR} at (350,32) size 1x0
+          LayoutBR {BR} at (350,32) size 1x0
           RenderText {#text} at (0,36) size 172x18
             text run at (0,36) width 172: "Second Row : unspecified "
           RenderInline {I} at (0,0) size 314x18
             RenderText {#text} at (171,36) size 314x18
               text run at (171,36) width 314: "(i.e. table height - height of other rows+borders)"
           RenderText {#text} at (0,0) size 0x0
       LayoutTable {TABLE} at (0,330) size 90x200 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 88x198
           LayoutTableRow {TR} at (0,2) size 88x22
             LayoutTableCell {TD} at (2,2) size 84x22 [border: (1px inset #808080)] [r=0 c=0 rs=1 cs=1]
               RenderText {#text} at (2,2) size 53x18
                 text run at (2,2) width 53: "title line"
           LayoutTableRow {TR} at (0,26) size 88x170
             LayoutTableCell {TD} at (2,100) size 84x22 [border: (1px inset #808080)] [r=1 c=0 rs=1 cs=1]
               RenderText {#text} at (2,2) size 80x18
                 text run at (2,2) width 80: "rest of space"
       RenderBlock {P} at (0,546) size 769x18
         RenderText {#text} at (0,0) size 307x18
           text run at (0,0) width 307: "This doesn't work because of the 1st bug above."
       RenderBlock {P} at (0,580) size 769x18
         RenderText {#text} at (0,0) size 416x18
           text run at (0,0) width 416: "A second attempt is to specify heights that do add up to the total."
       RenderBlock {P} at (0,614) size 769x54
         RenderText {#text} at (0,0) size 117x18
           text run at (0,0) width 117: "Table height: 200 "
-        RenderBR {BR} at (116,14) size 1x0
+        LayoutBR {BR} at (116,14) size 1x0
         RenderText {#text} at (0,18) size 89x18
           text run at (0,18) width 89: "First Row : 1 "
-        RenderBR {BR} at (88,32) size 1x0
+        LayoutBR {BR} at (88,32) size 1x0
         RenderText {#text} at (0,36) size 118x18
           text run at (0,36) width 118: "Second Row : 199"
       LayoutTable {TABLE} at (0,684) size 90x229 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 88x227
           LayoutTableRow {TR} at (0,2) size 88x22
             LayoutTableCell {TD} at (2,2) size 84x22 [border: (1px inset #808080)] [r=0 c=0 rs=1 cs=1]
               RenderText {#text} at (2,2) size 53x18
                 text run at (2,2) width 53: "title line"
           LayoutTableRow {TR} at (0,26) size 88x199
             LayoutTableCell {TD} at (2,114) size 84x22 [border: (1px inset #808080)] [r=1 c=0 rs=1 cs=1]
@@ skipping 16 matching lines @@
           text run at (498,0) width 224: "This contains a DIV whose style is"
           text run at (0,18) width 248: "height:100%. It ought to fill the entire "
           text run at (247,18) width 36: "table."
       LayoutTable {TABLE} at (0,1083) size 309x200 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 307x198
           LayoutTableRow {TR} at (0,2) size 307x194
             LayoutTableCell {TD} at (2,2) size 303x194 [border: (1px inset #808080)] [r=0 c=0 rs=1 cs=1]
               RenderBlock {DIV} at (2,2) size 299x190 [bgcolor=#FF0000]
                 RenderText {#text} at (0,0) size 299x18
                   text run at (0,0) width 299: "A 100% div inside a row of unspecified height"