Move and rename RenderBR to LayoutBR.

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

 layer at (0,0) size 800x600 clip at (0,0) size 785x600 scrollHeight 904
   RenderView at (0,0) size 800x600
 layer at (0,0) size 785x904 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600 outlineClip at (0,0) size 785x600
   RenderBlock {HTML} at (0,0) size 785x904
     RenderBody {BODY} at (8,8) size 769x888
       RenderBlock {DIV} at (0,0) size 769x170
         RenderBlock {HR} at (0,0) size 769x2 [border: (1px inset #EEEEEE)]
         RenderBlock {P} at (0,18) size 769x18
           RenderInline {B} at (0,0) size 337x17
             RenderText {#text} at (216,0) size 337x17
@@ skipping 175 matching lines @@
                       LayoutTableCell {TD} at (32,30) size 22x20 [border: (1px inset #808080)] [r=1 c=1 rs=1 cs=1]
                         RenderText {#text} at (1,1) size 20x17
                           text run at (1,1) width 20: "2,2"
                       LayoutTableCell {TD} at (59,30) size 28x20 [border: (1px inset #808080)] [r=1 c=2 rs=1 cs=2]
                         RenderText {#text} at (1,1) size 20x17
                           text run at (1,1) width 20: "2,3"
                       LayoutTableCell {TD} at (92,30) size 22x20 [border: (1px inset #808080)] [r=1 c=4 rs=1 cs=1]
                         RenderText {#text} at (1,1) size 20x17
                           text run at (1,1) width 20: "2,5"
       RenderBlock (anonymous) at (0,170) size 769x18
-        RenderBR {BR} at (0,0) size 0x17
+        LayoutBR {BR} at (0,0) size 0x17
       RenderBlock {P} at (0,204) size 769x90
         RenderText {#text} at (0,0) size 766x89
           text run at (0,0) width 325: "This is a table colspan counting problem (IMHO). "
           text run at (324,0) width 390: "The oversize <TABLE> has two rows: one has *two* <TD>"
           text run at (0,18) width 755: "\"requesting\" total of 3 columns to span; second row has *one* <TD> \"requesting\" total of 3 columns to span. In other"
           text run at (0,36) width 566: "words, it's asking for one more column than the max number of 'real' elements in a row. "
           text run at (565,36) width 178: "Here's the simple case (first"
           text run at (0,54) width 289: "one shows the problem; the other adjusts the "
           text run at (288,54) width 478: "colspan values and it works) (Dec 19 Nightly Win 95): All the elements in"
           text run at (0,72) width 455: "the two tables below are width=auto (i.e., no width attribute specified)."
       RenderBlock (anonymous) at (0,310) size 769x18
-        RenderBR {BR} at (0,0) size 0x17
+        LayoutBR {BR} at (0,0) size 0x17
       LayoutTable {TABLE} at (0,328) size 658x54 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 656x52
           LayoutTableRow {TR} at (0,0) size 656x26
             LayoutTableCell {TD} at (0,0) size 246x26 [border: (1px inset #808080)] [r=0 c=0 rs=1 cs=2]
               RenderBlock {P} at (4,4) size 238x18
                 RenderInline {B} at (0,0) size 118x17
                   RenderText {#text} at (0,0) size 118x17
                     text run at (0,0) width 118: "This is colspan=2"
             LayoutTableCell {TD} at (246,0) size 410x26 [border: (1px inset #808080)] [r=0 c=2 rs=1 cs=1]
               RenderText {#text} at (4,4) size 202x17
                 text run at (4,4) width 202: "Blah Blah Blah Blah Blah Blah"
           LayoutTableRow {TR} at (0,26) size 656x26
             LayoutTableCell {TD} at (0,26) size 656x26 [border: (1px inset #808080)] [r=1 c=0 rs=1 cs=3]
               RenderBlock {P} at (4,4) size 648x18
                 RenderInline {B} at (0,0) size 118x17
                   RenderText {#text} at (0,0) size 118x17
                     text run at (0,0) width 118: "This is colspan=3"
                 RenderText {#text} at (117,0) size 531x17
                   text run at (117,0) width 163: " blah blah blah blah blah "
                   text run at (279,0) width 369: "--- why doesn't this cell span the table (5.0 win95 jun17)?"
       RenderBlock (anonymous) at (0,382) size 769x36
-        RenderBR {BR} at (0,0) size 0x17
-        RenderBR {BR} at (0,18) size 0x17
+        LayoutBR {BR} at (0,0) size 0x17
+        LayoutBR {BR} at (0,18) size 0x17
       LayoutTable {TABLE} at (0,418) size 523x54 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 521x52
           LayoutTableRow {TR} at (0,0) size 521x26
             LayoutTableCell {TD} at (0,0) size 195x26 [border: (1px inset #808080)] [r=0 c=0 rs=1 cs=1]
               RenderBlock {P} at (4,4) size 187x18
                 RenderInline {B} at (0,0) size 118x17
                   RenderText {#text} at (0,0) size 118x17
                     text run at (0,0) width 118: "This is colspan=1"
             LayoutTableCell {TD} at (195,0) size 326x26 [border: (1px inset #808080)] [r=0 c=1 rs=1 cs=1]
               RenderText {#text} at (4,4) size 202x17
                 text run at (4,4) width 202: "Blah Blah Blah Blah Blah Blah"
           LayoutTableRow {TR} at (0,26) size 521x26
             LayoutTableCell {TD} at (0,26) size 521x26 [border: (1px inset #808080)] [r=1 c=0 rs=1 cs=2]
               RenderBlock {P} at (4,4) size 513x18
                 RenderInline {B} at (0,0) size 118x17
                   RenderText {#text} at (0,0) size 118x17
                     text run at (0,0) width 118: "This is colspan=2"
                 RenderText {#text} at (117,0) size 396x17
                   text run at (117,0) width 163: " blah blah blah blah blah "
                   text run at (279,0) width 234: "--- this cell spans the table correctly."
       RenderBlock (anonymous) at (0,472) size 769x18
-        RenderBR {BR} at (0,0) size 0x17
+        LayoutBR {BR} at (0,0) size 0x17
       RenderBlock {P} at (0,506) size 769x18
         RenderText {#text} at (0,0) size 233x17
           text run at (0,0) width 233: "Here's the test case from bug #2645."
       RenderBlock {P} at (0,540) size 769x54
         RenderText {#text} at (0,0) size 759x53
           text run at (0,0) width 555: "This test case (below) is derived from home.netscape.com (although not much is left). "
           text run at (554,0) width 205: "[This was the table structure for"
           text run at (0,18) width 718: "\"Autos ... Local ...\" and the right-hand column (\"ABCNews.com...\"); added an extra column to differentiate this"
           text run at (0,36) width 261: "example a bit more from the one above]."
       RenderBlock {P} at (0,610) size 769x72
@@ skipping 21 matching lines @@
               RenderText {#text} at (2,2) size 24x17
                 text run at (2,2) width 24: "that"
           LayoutTableRow {TR} at (0,26) size 678x22
             LayoutTableCell {TD} at (2,26) size 84x22 [border: (1px inset #808080)] [r=1 c=0 rs=1 cs=1]
               RenderText {#text} at (2,2) size 8x17
                 text run at (2,2) width 8: "x"
             LayoutTableCell {TD} at (88,26) size 588x22 [bgcolor=#99CCCC] [border: (1px inset #808080)] [r=1 c=1 rs=1 cs=4]
               RenderText {#text} at (2,2) size 330x17
                 text run at (2,2) width 330: "blue (colspan=4) --- doesn't span (5.0 win95 jun17)"
       RenderBlock (anonymous) at (0,750) size 769x18
-        RenderBR {BR} at (0,0) size 0x17
+        LayoutBR {BR} at (0,0) size 0x17
       RenderBlock {P} at (0,784) size 769x18
         RenderText {#text} at (0,0) size 436x17
           text run at (0,0) width 436: "Here's the same table but the 'colspan' values have been normalized."
       LayoutTable {TABLE} at (0,818) size 680x52 [border: (1px outset #808080)]
         LayoutTableSection {TBODY} at (1,1) size 678x50
           LayoutTableRow {TR} at (0,2) size 678x22
             LayoutTableCell {TD} at (2,2) size 77x22 [border: (1px inset #808080)] [r=0 c=0 rs=1 cs=1]
               RenderText {#text} at (2,2) size 8x17
                 text run at (2,2) width 8: "x"
             LayoutTableCell {TD} at (81,2) size 373x22 [border: (1px inset #808080)] [r=0 c=1 rs=1 cs=1]
               RenderText {#text} at (2,2) size 104x17
                 text run at (2,2) width 104: "this (colspan=1)"
             LayoutTableCell {TD} at (456,2) size 32x22 [bgcolor=#99CCCC] [border: (1px inset #808080)] [r=0 c=2 rs=1 cs=1]
               RenderText {#text} at (2,2) size 28x17
                 text run at (2,2) width 28: "blue"
             LayoutTableCell {TD} at (490,2) size 186x22 [border: (1px inset #808080)] [r=0 c=3 rs=1 cs=1]
               RenderText {#text} at (2,2) size 24x17
                 text run at (2,2) width 24: "that"
           LayoutTableRow {TR} at (0,26) size 678x22
             LayoutTableCell {TD} at (2,26) size 77x22 [border: (1px inset #808080)] [r=1 c=0 rs=1 cs=1]
               RenderText {#text} at (2,2) size 8x17
                 text run at (2,2) width 8: "x"
             LayoutTableCell {TD} at (81,26) size 595x22 [bgcolor=#99CCCC] [border: (1px inset #808080)] [r=1 c=1 rs=1 cs=3]
               RenderText {#text} at (2,2) size 229x17
                 text run at (2,2) width 229: "blue (colspan=3) --- spans correctly"
       RenderBlock (anonymous) at (0,870) size 769x18
-        RenderBR {BR} at (0,0) size 0x17
+        LayoutBR {BR} at (0,0) size 0x17