Remove mail blockquote special case handling.

LayoutTests/platform/chromium/editing/inserting/5418891-expected.txt

Index: LayoutTests/platform/chromium/editing/inserting/5418891-expected.txt
diff --git a/LayoutTests/platform/chromium/editing/inserting/5418891-expected.txt b/LayoutTests/platform/chromium/editing/inserting/5418891-expected.txt
deleted file mode 100644
index 8a4850fcfd1d9b1eff4bcb85e179005b81362004..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/chromium/editing/inserting/5418891-expected.txt
+++ /dev/null
@@ -1,23 +0,0 @@
-layer at (0,0) size 800x600
-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x600
-  RenderBlock {HTML} at (0,0) size 800x600
-    RenderBody {BODY} at (8,8) size 784x584
-      RenderBlock {P} at (0,0) size 784x36
-        RenderText {#text} at (0,0) size 772x36
-          text run at (0,0) width 536: "This tests for a crash when attempting to break a blockquote at the end of its content. "
-          text run at (536,0) width 236: "The caret should be in the first of two"
-          text run at (0,18) width 358: "empty paragraphs between two pieces of quoted content."
-      RenderBlock {DIV} at (0,52) size 784x72
-        RenderBlock {BLOCKQUOTE} at (0,0) size 784x18 [color=#0000FF] [border: none (2px solid #0000FF)]
-          RenderBlock {DIV} at (7,0) size 777x18
-            RenderText {#text} at (0,0) size 21x18
-              text run at (0,0) width 21: "foo"
-        RenderBlock (anonymous) at (0,18) size 784x36
-          RenderBR {BR} at (0,0) size 0x18
-          RenderBR {BR} at (0,18) size 0x18
-        RenderBlock {BLOCKQUOTE} at (0,54) size 784x18 [color=#0000FF] [border: none (2px solid #0000FF)]
-          RenderBlock {DIV} at (7,0) size 777x18
-            RenderText {#text} at (0,0) size 20x18
-              text run at (0,0) width 20: "bar"
-caret: position 0 of child 2 {BR} of child 2 {DIV} of body