Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/editing/selection/3690719-expected.txt

Index: LayoutTests/platform/linux/editing/selection/3690719-expected.txt
diff --git a/LayoutTests/platform/linux/editing/selection/3690719-expected.txt b/LayoutTests/platform/linux/editing/selection/3690719-expected.txt
index c5fcb15b64066b92d6f87096fc2f4a0718cc4dfd..289850aeca40d02b438216901f9555eb30d8e566 100644
--- a/LayoutTests/platform/linux/editing/selection/3690719-expected.txt
+++ b/LayoutTests/platform/linux/editing/selection/3690719-expected.txt
@@ -18,8 +18,8 @@ layer at (0,0) size 800x600
               LayoutTableCell {TD} at (0,17) size 784x1 [r=1 c=0 rs=1 cs=1]
                 LayoutImage {IMG} at (0,0) size 1x1
         RenderBlock (anonymous) at (0,20) size 784x40
-          RenderBR {BR} at (392,0) size 0x19
-          RenderBR {BR} at (392,20) size 0x19
+          LayoutBR {BR} at (392,0) size 0x19
+          LayoutBR {BR} at (392,20) size 0x19
         RenderBlock {DIV} at (0,60) size 784x108 [border: (2px solid #AAAAFF)]
           LayoutTable {TABLE} at (218,2) size 348x24
             LayoutTableSection {TBODY} at (0,0) size 348x24
@@ -73,7 +73,7 @@ layer at (0,0) size 800x600
                     text run at (0,0) width 4: " "
                 LayoutTableCell {TD} at (182,0) size 364x44 [r=0 c=1 rs=1 cs=1]
                   LayoutTextControl {INPUT} at (0,0) size 364x22 [bgcolor=#FFFFFF] [border: (2px inset #EEEEEE)]
-                  RenderBR {BR} at (364,16) size 0x0
+                  LayoutBR {BR} at (364,16) size 0x0
                   RenderButton {INPUT} at (72.50,22) size 102x22 [bgcolor=#C0C0C0] [border: (2px outset #C0C0C0)]
                     RenderBlock (anonymous) at (8,3) size 86x16
                       RenderText {#text} at (0,0) size 86x16
@@ -89,20 +89,20 @@ layer at (0,0) size 800x600
                     RenderInline {A} at (0,0) size 68x12 [color=#0000CC]
                       RenderText {#text} at (6,0) size 68x12
                         text run at (6,0) width 68: "Advanced Search"
-                    RenderBR {BR} at (74,10) size 0x0
+                    LayoutBR {BR} at (74,10) size 0x0
                     RenderText {#text} at (0,12) size 6x12
                       text run at (0,12) width 6: "  "
                     RenderInline {A} at (0,0) size 43x12 [color=#0000CC]
                       RenderText {#text} at (6,12) size 43x12
                         text run at (6,12) width 43: "Preferences"
-                    RenderBR {BR} at (49,22) size 0x0
+                    LayoutBR {BR} at (49,22) size 0x0
                     RenderText {#text} at (0,24) size 6x12
                       text run at (0,24) width 6: "  "
                     RenderInline {A} at (0,0) size 65x12 [color=#0000CC]
                       RenderText {#text} at (6,24) size 65x12
                         text run at (6,24) width 65: "Language Tools"
           RenderBlock (anonymous) at (2,70) size 780x36
-            RenderBR {BR} at (390,0) size 0x19
+            LayoutBR {BR} at (390,0) size 0x19
             RenderInline {FONT} at (0,0) size 146x15
               RenderInline {FONT} at (0,0) size 28x15 [color=#FF0000]
                 RenderText {#text} at (317,20) size 28x15
@@ -116,9 +116,9 @@ layer at (0,0) size 800x600
                 text run at (460,20) width 3: "."
             RenderText {#text} at (0,0) size 0x0
         RenderBlock (anonymous) at (0,168) size 784x76
-          RenderBR {BR} at (392,0) size 0x19
-          RenderBR {BR} at (392,20) size 0x19
-          RenderBR {BR} at (392,40) size 0x19
+          LayoutBR {BR} at (392,0) size 0x19
+          LayoutBR {BR} at (392,20) size 0x19
+          LayoutBR {BR} at (392,40) size 0x19
           RenderInline {FONT} at (0,0) size 316x15
             RenderInline {A} at (0,0) size 117x15 [color=#0000CC]
               RenderText {#text} at (234,60) size 117x15