Move and rename RenderBR to LayoutBR.

LayoutTests/platform/mac/editing/unsupported-content/table-delete-003-expected.txt

Index: LayoutTests/platform/mac/editing/unsupported-content/table-delete-003-expected.txt
diff --git a/LayoutTests/platform/mac/editing/unsupported-content/table-delete-003-expected.txt b/LayoutTests/platform/mac/editing/unsupported-content/table-delete-003-expected.txt
index 07e70b88ae445a50618a14451fb365090f5fc919..6f01c5f1c233484c8b5f9ef310b00a1eff5ab32a 100644
--- a/LayoutTests/platform/mac/editing/unsupported-content/table-delete-003-expected.txt
+++ b/LayoutTests/platform/mac/editing/unsupported-content/table-delete-003-expected.txt
@@ -20,25 +20,25 @@ layer at (0,0) size 800x600
         RenderBlock {DIV} at (20,20) size 744x72
           RenderText {#text} at (0,0) size 68x28
             text run at (0,0) width 68: "Tests: "
-          RenderBR {BR} at (0,0) size 0x0
+          LayoutBR {BR} at (0,0) size 0x0
           RenderText {#text} at (0,28) size 656x22
             text run at (0,28) width 656: "Our ability to \"edit around\" content the HTML editing code does not yet handle very well. "
-          RenderBR {BR} at (655,45) size 1x0
+          LayoutBR {BR} at (655,45) size 1x0
           RenderInline {I} at (0,0) size 98x22
             RenderText {#text} at (0,50) size 98x22
               text run at (0,50) width 98: "For this test: "
           RenderText {#text} at (97,50) size 388x22
             text run at (97,50) width 388: "Select and delete a list and some surrounding content."
         RenderBlock (anonymous) at (20,92) size 744x22
-          RenderBR {BR} at (0,0) size 0x22
+          LayoutBR {BR} at (0,0) size 0x22
         RenderBlock {DIV} at (20,114) size 744x138
           RenderText {#text} at (0,0) size 190x28
             text run at (0,0) width 190: "Expected Results: "
-          RenderBR {BR} at (189,22) size 1x0
+          LayoutBR {BR} at (189,22) size 1x0
           RenderText {#text} at (0,28) size 700x44
             text run at (0,28) width 700: "The content in the red box must exactly match the content in the green box (except for the border"
             text run at (0,50) width 52: "color). "
-          RenderBR {BR} at (51,67) size 1x0
+          LayoutBR {BR} at (51,67) size 1x0
           RenderInline {I} at (0,0) size 98x22
             RenderText {#text} at (0,72) size 98x22
               text run at (0,72) width 98: "For this test: "
@@ -46,7 +46,7 @@ layer at (0,0) size 800x600
             text run at (97,72) width 301: "Only selected content should get deleted. "
             text run at (397,72) width 339: "Surrounding content that is not selected should"
             text run at (0,94) width 204: "(obviously) not be affected. "
-          RenderBR {BR} at (203,111) size 1x0
+          LayoutBR {BR} at (203,111) size 1x0
           RenderInline {B} at (0,0) size 709x22
             RenderText {#text} at (0,116) size 709x22
               text run at (0,116) width 709: "There is a bug: the caret ends up in the wrong position, it should be in the empty paragraph."
@@ -58,12 +58,12 @@ layer at (0,0) size 800x600
           RenderText {#text} at (0,0) size 0x0
       RenderBlock (anonymous) at (0,282) size 784x130
         RenderBlock {DIV} at (0,0) size 784x60 [border: (2px solid #008000)]
-          RenderBR {BR} at (2,2) size 0x28
+          LayoutBR {BR} at (2,2) size 0x28
           RenderText {#text} at (2,30) size 50x28
             text run at (2,30) width 50: "after"
         RenderBlock {DIV} at (0,70) size 784x60
           RenderBlock {DIV} at (0,0) size 784x60 [border: (2px solid #FF0000)]
-            RenderBR {BR} at (2,2) size 0x28
+            LayoutBR {BR} at (2,2) size 0x28
             RenderText {#text} at (2,30) size 50x28
               text run at (2,30) width 50: "after"
       RenderBlock (anonymous) at (0,412) size 784x0