Move and rename RenderBR to LayoutBR.

LayoutTests/platform/win-xp/tables/mozilla/bugs/bug1302-expected.txt

 layer at (0,0) size 800x600 clip at (0,0) size 785x600 scrollHeight 972
   RenderView at (0,0) size 800x600
 layer at (0,0) size 785x972 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600 outlineClip at (0,0) size 785x600
   RenderBlock {HTML} at (0,0) size 785x972
     RenderBody {BODY} at (8,8) size 769x956
       RenderBlock {DIV} at (0,0) size 769x180
         RenderBlock {HR} at (0,0) size 769x2 [border: (1px inset #EEEEEE)]
         RenderBlock {P} at (0,18) size 769x20
           RenderInline {B} at (0,0) size 327x19
             RenderText {#text} at (221,0) size 327x19
@@ skipping 175 matching lines @@
                       LayoutTableCell {TD} at (32,32) size 22x22 [border: (1px inset #808080)] [r=1 c=1 rs=1 cs=1]
                         RenderText {#text} at (1,1) size 20x19
                           text run at (1,1) width 20: "2,2"
                       LayoutTableCell {TD} at (59,32) size 28x22 [border: (1px inset #808080)] [r=1 c=2 rs=1 cs=2]
                         RenderText {#text} at (1,1) size 20x19
                           text run at (1,1) width 20: "2,3"
                       LayoutTableCell {TD} at (92,32) size 22x22 [border: (1px inset #808080)] [r=1 c=4 rs=1 cs=1]
                         RenderText {#text} at (1,1) size 20x19
                           text run at (1,1) width 20: "2,5"
       RenderBlock (anonymous) at (0,180) size 769x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       RenderBlock {P} at (0,216) size 769x100
         RenderText {#text} at (0,0) size 768x99
           text run at (0,0) width 304: "This is a table colspan counting problem (IMHO). "
           text run at (304,0) width 444: "The oversize <TABLE> has two rows: one has *two* <TD> \"requesting\""
           text run at (0,20) width 760: "total of 3 columns to span; second row has *one* <TD> \"requesting\" total of 3 columns to span. In other words, it's asking for"
           text run at (0,40) width 398: "one more column than the max number of 'real' elements in a row. "
           text run at (398,40) width 370: "Here's the simple case (first one shows the problem; the other"
           text run at (0,60) width 68: "adjusts the "
           text run at (68,60) width 446: "colspan values and it works) (Dec 19 Nightly Win 95): All the elements in "
           text run at (514,60) width 251: "the two tables below are width=auto (i.e.,"
           text run at (0,80) width 171: "no width attribute specified)."
       RenderBlock (anonymous) at (0,332) size 769x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       LayoutTable {TABLE} at (0,352) size 623x58 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 621x56
           LayoutTableRow {TR} at (0,0) size 621x28
             LayoutTableCell {TD} at (0,0) size 244x28 [border: (1px inset #808080)] [r=0 c=0 rs=1 cs=2]
               RenderBlock {P} at (4,4) size 236x20
                 RenderInline {B} at (0,0) size 115x19
                   RenderText {#text} at (0,0) size 115x19
                     text run at (0,0) width 115: "This is colspan=2"
             LayoutTableCell {TD} at (244,0) size 377x28 [border: (1px inset #808080)] [r=0 c=2 rs=1 cs=1]
               RenderText {#text} at (4,4) size 182x19
                 text run at (4,4) width 182: "Blah Blah Blah Blah Blah Blah"
           LayoutTableRow {TR} at (0,28) size 621x28
             LayoutTableCell {TD} at (0,28) size 621x28 [border: (1px inset #808080)] [r=1 c=0 rs=1 cs=3]
               RenderBlock {P} at (4,4) size 613x20
                 RenderInline {B} at (0,0) size 115x19
                   RenderText {#text} at (0,0) size 115x19
                     text run at (0,0) width 115: "This is colspan=3"
                 RenderText {#text} at (115,0) size 498x19
                   text run at (115,0) width 149: " blah blah blah blah blah "
                   text run at (264,0) width 349: "--- why doesn't this cell span the table (5.0 win95 jun17)?"
       RenderBlock (anonymous) at (0,410) size 769x40
-        RenderBR {BR} at (0,0) size 0x19
-        RenderBR {BR} at (0,20) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,20) size 0x19
       LayoutTable {TABLE} at (0,450) size 494x58 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 492x56
           LayoutTableRow {TR} at (0,0) size 492x28
             LayoutTableCell {TD} at (0,0) size 193x28 [border: (1px inset #808080)] [r=0 c=0 rs=1 cs=1]
               RenderBlock {P} at (4,4) size 185x20
                 RenderInline {B} at (0,0) size 115x19
                   RenderText {#text} at (0,0) size 115x19
                     text run at (0,0) width 115: "This is colspan=1"
             LayoutTableCell {TD} at (193,0) size 299x28 [border: (1px inset #808080)] [r=0 c=1 rs=1 cs=1]
               RenderText {#text} at (4,4) size 182x19
                 text run at (4,4) width 182: "Blah Blah Blah Blah Blah Blah"
           LayoutTableRow {TR} at (0,28) size 492x28
             LayoutTableCell {TD} at (0,28) size 492x28 [border: (1px inset #808080)] [r=1 c=0 rs=1 cs=2]
               RenderBlock {P} at (4,4) size 484x20
                 RenderInline {B} at (0,0) size 115x19
                   RenderText {#text} at (0,0) size 115x19
                     text run at (0,0) width 115: "This is colspan=2"
                 RenderText {#text} at (115,0) size 369x19
                   text run at (115,0) width 149: " blah blah blah blah blah "
                   text run at (264,0) width 220: "--- this cell spans the table correctly."
       RenderBlock (anonymous) at (0,508) size 769x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       RenderBlock {P} at (0,544) size 769x20
         RenderText {#text} at (0,0) size 223x19
           text run at (0,0) width 223: "Here's the test case from bug #2645."
       RenderBlock {P} at (0,580) size 769x60
         RenderText {#text} at (0,0) size 767x59
           text run at (0,0) width 516: "This test case (below) is derived from home.netscape.com (although not much is left). "
           text run at (516,0) width 251: "[This was the table structure for \"Autos ..."
           text run at (0,20) width 759: "Local ...\" and the right-hand column (\"ABCNews.com...\"); added an extra column to differentiate this example a bit more from"
           text run at (0,40) width 94: "the one above]."
       RenderBlock {P} at (0,656) size 769x80
@@ skipping 21 matching lines @@
               RenderText {#text} at (2,2) size 22x19
                 text run at (2,2) width 22: "that"
           LayoutTableRow {TR} at (0,28) size 678x24
             LayoutTableCell {TD} at (2,28) size 84x24 [border: (1px inset #808080)] [r=1 c=0 rs=1 cs=1]
               RenderText {#text} at (2,2) size 7x19
                 text run at (2,2) width 7: "x"
             LayoutTableCell {TD} at (88,28) size 588x24 [bgcolor=#99CCCC] [border: (1px inset #808080)] [r=1 c=1 rs=1 cs=4]
               RenderText {#text} at (2,2) size 316x19
                 text run at (2,2) width 316: "blue (colspan=4) --- doesn't span (5.0 win95 jun17)"
       RenderBlock (anonymous) at (0,808) size 769x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19
       RenderBlock {P} at (0,844) size 769x20
         RenderText {#text} at (0,0) size 409x19
           text run at (0,0) width 409: "Here's the same table but the 'colspan' values have been normalized."
       LayoutTable {TABLE} at (0,880) size 680x56 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 678x54
           LayoutTableRow {TR} at (0,2) size 678x24
             LayoutTableCell {TD} at (2,2) size 77x24 [border: (1px inset #808080)] [r=0 c=0 rs=1 cs=1]
               RenderText {#text} at (2,2) size 7x19
                 text run at (2,2) width 7: "x"
             LayoutTableCell {TD} at (81,2) size 375x24 [border: (1px inset #808080)] [r=0 c=1 rs=1 cs=1]
               RenderText {#text} at (2,2) size 97x19
                 text run at (2,2) width 97: "this (colspan=1)"
             LayoutTableCell {TD} at (458,2) size 29x24 [bgcolor=#99CCCC] [border: (1px inset #808080)] [r=0 c=2 rs=1 cs=1]
               RenderText {#text} at (2,2) size 25x19
                 text run at (2,2) width 25: "blue"
             LayoutTableCell {TD} at (489,2) size 187x24 [border: (1px inset #808080)] [r=0 c=3 rs=1 cs=1]
               RenderText {#text} at (2,2) size 22x19
                 text run at (2,2) width 22: "that"
           LayoutTableRow {TR} at (0,28) size 678x24
             LayoutTableCell {TD} at (2,28) size 77x24 [border: (1px inset #808080)] [r=1 c=0 rs=1 cs=1]
               RenderText {#text} at (2,2) size 7x19
                 text run at (2,2) width 7: "x"
             LayoutTableCell {TD} at (81,28) size 595x24 [bgcolor=#99CCCC] [border: (1px inset #808080)] [r=1 c=1 rs=1 cs=3]
               RenderText {#text} at (2,2) size 219x19
                 text run at (2,2) width 219: "blue (colspan=3) --- spans correctly"
       RenderBlock (anonymous) at (0,936) size 769x20
-        RenderBR {BR} at (0,0) size 0x19
+        LayoutBR {BR} at (0,0) size 0x19