Move and rename RenderBR to LayoutBR.

LayoutTests/platform/linux/fast/forms/basic-inputs-expected.txt

Index: LayoutTests/platform/linux/fast/forms/basic-inputs-expected.txt
diff --git a/LayoutTests/platform/linux/fast/forms/basic-inputs-expected.txt b/LayoutTests/platform/linux/fast/forms/basic-inputs-expected.txt
index 38d9be2c87b3acde964a90123ca1631ec5027a37..1239a8c19a31b0da3fcf8a83253bb45a055954a8 100644
--- a/LayoutTests/platform/linux/fast/forms/basic-inputs-expected.txt
+++ b/LayoutTests/platform/linux/fast/forms/basic-inputs-expected.txt
@@ -6,31 +6,31 @@ layer at (0,0) size 800x600
       RenderBlock (anonymous) at (0,0) size 470x320
         RenderText {#text} at (0,0) size 310x19
           text run at (0,0) width 310: "This tests basic inputs. Here's what you should see: "
-        RenderBR {BR} at (310,15) size 0x0
-        RenderBR {BR} at (0,20) size 0x19
+        LayoutBR {BR} at (310,15) size 0x0
+        LayoutBR {BR} at (0,20) size 0x19
         RenderText {#text} at (0,40) size 458x59
           text run at (0,40) width 400: "first line: the letter \"a\" and then a text input field filled with repeating"
           text run at (0,60) width 79: "\"foobarbaz\", "
           text run at (79,60) width 379: "then the word \"text\" followed by a disabled text input field filled"
           text run at (0,80) width 272: "with \"foo\" and then the letter \"b\" and then \"a\" "
-        RenderBR {BR} at (272,95) size 0x0
-        RenderBR {BR} at (0,100) size 0x19
+        LayoutBR {BR} at (272,95) size 0x0
+        LayoutBR {BR} at (0,100) size 0x19
         RenderText {#text} at (0,120) size 459x59
           text run at (0,120) width 441: "second line: and then a password input field that's filled and then the word"
           text run at (0,140) width 459: "\"password\" and then a disabled password field that's filled and then the letter"
           text run at (0,160) width 22: "\"b\" "
-        RenderBR {BR} at (22,175) size 0x0
-        RenderBR {BR} at (0,180) size 0x19
+        LayoutBR {BR} at (22,175) size 0x0
+        LayoutBR {BR} at (0,180) size 0x19
         RenderText {#text} at (0,200) size 426x39
           text run at (0,200) width 426: "third line: the letter \"a\" and then a checkbox (unchecked) with the word"
           text run at (0,220) width 338: "\"checkbox\" and then a disabled checkbox and letter \"b\" "
-        RenderBR {BR} at (338,235) size 0x0
-        RenderBR {BR} at (0,240) size 0x19
+        LayoutBR {BR} at (338,235) size 0x0
+        LayoutBR {BR} at (0,240) size 0x19
         RenderText {#text} at (0,260) size 459x39
           text run at (0,260) width 453: "fourth line: the last line has the letter \"a\" and then a redio button (unselected)"
           text run at (0,280) width 459: "and then the word \"radio\" and then a disabled radio button and the letter \"b\" "
-        RenderBR {BR} at (459,295) size 0x0
-        RenderBR {BR} at (0,300) size 0x19
+        LayoutBR {BR} at (459,295) size 0x0
+        LayoutBR {BR} at (0,300) size 0x19
       RenderBlock {DIV} at (10,330) size 450x46 [border: (1px solid #FF0000)]
         RenderText {#text} at (1,2) size 7x19
           text run at (1,2) width 7: "a"