Remove mail blockquote special case handling.

LayoutTests/platform/chromium/editing/pasteboard/merge-end-blockquote-expected.txt

Index: LayoutTests/platform/chromium/editing/pasteboard/merge-end-blockquote-expected.txt
diff --git a/LayoutTests/platform/chromium/editing/pasteboard/merge-end-blockquote-expected.txt b/LayoutTests/platform/chromium/editing/pasteboard/merge-end-blockquote-expected.txt
deleted file mode 100644
index 4e3199d46cf0d42a49aa9a501ed83613ba08c32f..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/chromium/editing/pasteboard/merge-end-blockquote-expected.txt
+++ /dev/null
@@ -1,44 +0,0 @@
-EDITING DELEGATE: shouldBeginEditingInDOMRange:range from 0 of DIV > BODY > HTML > #document to 1 of DIV > BODY > HTML > #document
-EDITING DELEGATE: webViewDidBeginEditing:WebViewDidBeginEditingNotification
-EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 17 of #text > DIV > BODY > HTML > #document to 17 of #text > DIV > BODY > HTML > #document toDOMRange:range from 16 of #text > DIV > BODY > HTML > #document to 16 of #text > DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
-EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
-EDITING DELEGATE: shouldEndEditingInDOMRange:range from 0 of DIV > BODY > HTML > #document to 1 of DIV > BODY > HTML > #document
-EDITING DELEGATE: webViewDidEndEditing:WebViewDidEndEditingNotification
-EDITING DELEGATE: shouldBeginEditingInDOMRange:range from 0 of DIV > BODY > HTML > #document to 1 of DIV > BODY > HTML > #document
-EDITING DELEGATE: webViewDidBeginEditing:WebViewDidBeginEditingNotification
-EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 14 of #text > DIV > BLOCKQUOTE > DIV > BODY > HTML > #document to 14 of #text > DIV > BLOCKQUOTE > DIV > BODY > HTML > #document toDOMRange:range from 3 of #text > DIV > BLOCKQUOTE > DIV > BODY > HTML > #document to 3 of #text > DIV > BLOCKQUOTE > DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
-EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
-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 784x576
-      RenderBlock {P} at (0,0) size 784x18
-        RenderText {#text} at (0,0) size 606x18
-          text run at (0,0) width 397: "This tests pasting a Mail blockquote at the start of a paragraph. "
-          text run at (397,0) width 209: "Blockquoting should be stripped."
-      RenderBlock {DIV} at (0,34) size 784x18
-        RenderText {#text} at (0,0) size 122x18
-          text run at (0,0) width 122: "Blockquoted Textx"
-      RenderBlock {P} at (0,68) size 784x36
-        RenderText {#text} at (0,0) size 759x36
-          text run at (0,0) width 289: "This tests pasting text into a Mail blockquote. "
-          text run at (289,0) width 470: "The last bit of content in the incoming fragment should be merged with the"
-          text run at (0,18) width 287: "paragraph after the position being pasted into."
-      RenderBlock {DIV} at (0,120) size 784x52
-        RenderBlock {BLOCKQUOTE} at (40,0) size 704x18
-          RenderBlock {DIV} at (0,0) size 704x18
-            RenderText {#text} at (0,0) size 102x18
-              text run at (0,0) width 102: "Blockquotedfoo"
-        RenderBlock (anonymous) at (0,34) size 784x0
-        RenderBlock {BLOCKQUOTE} at (40,34) size 704x18
-          RenderBlock {DIV} at (0,0) size 704x18
-            RenderText {#text} at (0,0) size 49x18
-              text run at (0,0) width 49: "barText"
-caret: position 3 of child 0 {#text} of child 0 {DIV} of child 1 {BLOCKQUOTE} of child 10 {DIV} of body