Remove mail blockquote special case handling.

Source/WebCore/editing/markup.cpp

Index: Source/WebCore/editing/markup.cpp
diff --git a/Source/WebCore/editing/markup.cpp b/Source/WebCore/editing/markup.cpp
index a8f75bdfe5bb74905fc955edcf6d4e974f8c2aec..f1e6dea8bb55d06018634dadaba527a35e46553b 100644
--- a/Source/WebCore/editing/markup.cpp
+++ b/Source/WebCore/editing/markup.cpp
@@ -520,10 +520,6 @@ static Node* highestAncestorToWrapMarkup(const Range* range, EAnnotateForInterch
                     specialCommonAncestor = specialCommonAncestor->parentNode();
             }
         }
-
-        // Retain the Mail quote level by including all ancestor mail block quotes.
-        if (Node* highestMailBlockquote = highestEnclosingNodeOfType(firstPositionInOrBeforeNode(range->firstNode()), isMailBlockquote, CanCrossEditingBoundary))
-            specialCommonAncestor = highestMailBlockquote;
     }
 
     Node* checkAncestor = specialCommonAncestor ? specialCommonAncestor : commonAncestor;