Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/editing/inserting/return-key-with-selection-003-expected.txt

Index: LayoutTests/platform/linux/editing/inserting/return-key-with-selection-003-expected.txt
diff --git a/LayoutTests/platform/linux/editing/inserting/return-key-with-selection-003-expected.txt b/LayoutTests/platform/linux/editing/inserting/return-key-with-selection-003-expected.txt
index 8d20f89cbe0dddd25e0419edb8ca8dd22f4ac507..6bdeb215ce49b07c10a947f8821c56219316af8d 100644
--- a/LayoutTests/platform/linux/editing/inserting/return-key-with-selection-003-expected.txt
+++ b/LayoutTests/platform/linux/editing/inserting/return-key-with-selection-003-expected.txt
@@ -15,7 +15,7 @@ layer at (0,0) size 800x600
         RenderBlock {DIV} at (14,14) size 756x111
           RenderText {#text} at (0,0) size 66x26
             text run at (0,0) width 66: "Tests: "
-          RenderBR {BR} at (66,21) size 0x0
+          LayoutBR {BR} at (66,21) size 0x0
           RenderText {#text} at (0,27) size 604x27
             text run at (0,27) width 604: "A scenario I thought of based on my experiences with this bug:"
           RenderInline {A} at (0,0) size 257x27 [color=#0000EE]
@@ -28,7 +28,7 @@ layer at (0,0) size 800x600
           RenderBlock (anonymous) at (0,0) size 756x111
             RenderText {#text} at (0,0) size 189x26
               text run at (0,0) width 189: "Expected Results: "
-            RenderBR {BR} at (189,21) size 0x0
+            LayoutBR {BR} at (189,21) size 0x0
             RenderText {#text} at (0,27) size 739x83
               text run at (0,27) width 718: "Should see this content in the red box below (note that there should be two"
               text run at (0,55) width 739: "blank lines between \"foo\" and \"baz\"; also note that the insertion point should"
@@ -37,9 +37,9 @@ layer at (0,0) size 800x600
             RenderText {#text} at (0,0) size 32x27
               text run at (0,0) width 32: "foo"
           RenderBlock {DIV} at (0,139) size 756x28
-            RenderBR {BR} at (0,0) size 0x27
+            LayoutBR {BR} at (0,0) size 0x27
           RenderBlock {DIV} at (0,167) size 756x28
-            RenderBR {BR} at (0,0) size 0x27
+            LayoutBR {BR} at (0,0) size 0x27
           RenderBlock {DIV} at (0,195) size 756x28
             RenderText {#text} at (0,0) size 33x27
               text run at (0,0) width 33: "baz"
@@ -49,9 +49,9 @@ layer at (0,0) size 800x600
             RenderText {#text} at (0,0) size 32x27
               text run at (0,0) width 32: "foo"
           RenderBlock {DIV} at (2,30) size 780x28
-            RenderBR {BR} at (0,0) size 0x27
+            LayoutBR {BR} at (0,0) size 0x27
           RenderBlock {DIV} at (2,58) size 780x28
-            RenderBR {BR} at (0,0) size 0x27
+            LayoutBR {BR} at (0,0) size 0x27
           RenderBlock {DIV} at (2,86) size 780x28
             RenderText {#text} at (0,0) size 33x27
               text run at (0,0) width 33: "baz"