Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/tables/mozilla/bugs/bug16012-expected.txt

Index: LayoutTests/platform/mac/tables/mozilla/bugs/bug16012-expected.txt
diff --git a/LayoutTests/platform/mac/tables/mozilla/bugs/bug16012-expected.txt b/LayoutTests/platform/mac/tables/mozilla/bugs/bug16012-expected.txt
index 732b89f4afc2f673165f90605cc62ca48d5b222a..99519d3a54f9140da78ec4e7257d1cf4af488ae1 100644
--- a/LayoutTests/platform/mac/tables/mozilla/bugs/bug16012-expected.txt
+++ b/LayoutTests/platform/mac/tables/mozilla/bugs/bug16012-expected.txt
@@ -6,8 +6,8 @@ layer at (0,0) size 800x600
       RenderBlock (anonymous) at (0,0) size 784x36
         RenderText {#text} at (0,0) size 268x18
           text run at (0,0) width 268: "Tables: both lines should be 1 pixel thick."
-        RenderBR {BR} at (267,14) size 1x0
-        RenderBR {BR} at (0,18) size 0x18
+        LayoutBR {BR} at (267,14) size 1x0
+        LayoutBR {BR} at (0,18) size 0x18
       LayoutTable {TABLE} at (0,36) size 37x5
         LayoutTableSection {TBODY} at (0,0) size 37x5
           LayoutTableRow {TR} at (0,2) size 37x1
@@ -15,34 +15,34 @@ layer at (0,0) size 800x600
               LayoutImage {IMG} at (0,0) size 30x1
             LayoutTableCell {TD} at (35,2) size 0x0 [r=0 c=1 rs=1 cs=1]
       RenderBlock (anonymous) at (0,41) size 784x18
-        RenderBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
       LayoutTable {TABLE} at (0,59) size 34x5
         LayoutTableSection {TBODY} at (0,0) size 34x5
           LayoutTableRow {TR} at (0,2) size 34x1
             LayoutTableCell {TD} at (2,2) size 30x1 [bgcolor=#FF0000] [r=0 c=0 rs=1 cs=1]
               LayoutImage {IMG} at (0,0) size 30x1
       RenderBlock (anonymous) at (0,64) size 784x170
-        RenderBR {BR} at (0,0) size 0x18
-        RenderBR {BR} at (0,18) size 0x18
-        RenderBR {BR} at (0,36) size 0x18
+        LayoutBR {BR} at (0,0) size 0x18
+        LayoutBR {BR} at (0,18) size 0x18
+        LayoutBR {BR} at (0,36) size 0x18
         RenderText {#text} at (0,54) size 403x18
           text run at (0,54) width 224: "2 texts, FACE=\"Arial, Helvetica\", "
           text run at (223,54) width 180: "1st at size=0, 2nd at size=-4"
-        RenderBR {BR} at (402,68) size 1x0
-        RenderBR {BR} at (0,72) size 0x18
+        LayoutBR {BR} at (402,68) size 1x0
+        LayoutBR {BR} at (0,72) size 0x18
         RenderInline {FONT} at (0,0) size 101x22
           RenderText {#text} at (0,90) size 101x11
             text run at (0,90) width 101: "Detonator 3.53 Drivers"
-          RenderBR {BR} at (100,99) size 1x0
+          LayoutBR {BR} at (100,99) size 1x0
           RenderText {#text} at (0,101) size 74x11
             text run at (0,101) width 74: "Available NOW! "
-        RenderBR {BR} at (73,110) size 1x0
-        RenderBR {BR} at (0,112) size 0x18
+        LayoutBR {BR} at (73,110) size 1x0
+        LayoutBR {BR} at (0,112) size 0x18
         RenderInline {FONT} at (0,0) size 101x22
           RenderText {#text} at (0,130) size 101x11
             text run at (0,130) width 101: "Detonator 3.53 Drivers"
-          RenderBR {BR} at (100,139) size 1x0
+          LayoutBR {BR} at (100,139) size 1x0
           RenderText {#text} at (0,141) size 74x11
             text run at (0,141) width 74: "Available NOW! "
-        RenderBR {BR} at (73,150) size 1x0
-        RenderBR {BR} at (0,152) size 0x18
+        LayoutBR {BR} at (73,150) size 1x0
+        LayoutBR {BR} at (0,152) size 0x18