Remove dead markup serialization code.

sky/engine/core/editing/EditorCommand.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Igalia S.L.
  *
  * 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
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 22 matching lines @@
 #include "sky/engine/bindings/core/v8/ExceptionState.h"
 #include "sky/engine/bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "sky/engine/core/css/CSSValueList.h"
 #include "sky/engine/core/css/StylePropertySet.h"
 #include "sky/engine/core/dom/DocumentFragment.h"
 #include "sky/engine/core/editing/FrameSelection.h"
 #include "sky/engine/core/editing/ReplaceSelectionCommand.h"
 #include "sky/engine/core/editing/SpellChecker.h"
 #include "sky/engine/core/editing/TypingCommand.h"
 #include "sky/engine/core/editing/htmlediting.h"
-#include "sky/engine/core/editing/markup.h"
 #include "sky/engine/core/events/Event.h"
 #include "sky/engine/core/frame/FrameHost.h"
 #include "sky/engine/core/frame/FrameView.h"
 #include "sky/engine/core/frame/LocalFrame.h"
 #include "sky/engine/core/frame/Settings.h"
 #include "sky/engine/core/html/HTMLImageElement.h"
 #include "sky/engine/core/page/Chrome.h"
 #include "sky/engine/core/page/EditorClient.h"
 #include "sky/engine/core/page/EventHandler.h"
 #include "sky/engine/core/rendering/RenderBox.h"
@@ skipping 594 matching lines @@
 {
     return m_command && m_command->isTextInsertion;
 }
 
 int Editor::Command::idForHistogram() const
 {
     return isSupported() ? m_command->idForUserMetrics : 0;
 }
 
 } // namespace blink