Remove mail blockquote special case handling.

Source/WebCore/editing/markup.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009, 2010, 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Igalia S.L.
  * Copyright (C) 2011 Motorola Mobility. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 502 matching lines @@
         // the structure and appearance of the copied markup.
         specialCommonAncestor = ancestorToRetainStructureAndAppearance(commonAncestor);
 
         if (Node* parentListNode = enclosingNodeOfType(firstPositionInOrBeforeNode(range->firstNode()), isListItem)) {
             if (WebCore::areRangesEqual(VisibleSelection::selectionFromContentsOfNode(parentListNode).toNormalizedRange().get(), range)) {
                 specialCommonAncestor = parentListNode->parentNode();
                 while (specialCommonAncestor && !isListElement(specialCommonAncestor))
                     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;
     if (checkAncestor->renderer()) {
         Node* newSpecialCommonAncestor = highestEnclosingNodeOfType(firstPositionInNode(checkAncestor), &isElementPresentational, CanCrossEditingBoundary, checkAncestor->renderer()->containingBlock()->node());
         if (newSpecialCommonAncestor)
             specialCommonAncestor = newSpecialCommonAncestor;
     }
 
     // If a single tab is selected, commonAncestor will be a text node inside a tab span.
@@ skipping 555 matching lines @@
     if (hasOneChild(containerNode.get())) {
         containerNode->replaceChild(textNode.release(), containerNode->firstChild(), ec);
         return;
     }
 
     containerNode->removeChildren();
     containerNode->appendChild(textNode.release(), ec);
 }
 
 }