Remove dead markup serialization code.

sky/engine/core/dom/shadow/ShadowRoot.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 18 matching lines @@
 
 #include "sky/engine/bindings/core/v8/ExceptionState.h"
 #include "sky/engine/core/css/StyleSheetList.h"
 #include "sky/engine/core/css/resolver/StyleResolver.h"
 #include "sky/engine/core/dom/ElementTraversal.h"
 #include "sky/engine/core/dom/StyleEngine.h"
 #include "sky/engine/core/dom/Text.h"
 #include "sky/engine/core/dom/shadow/ElementShadow.h"
 #include "sky/engine/core/dom/shadow/InsertionPoint.h"
 #include "sky/engine/core/dom/shadow/ShadowRootRareData.h"
-#include "sky/engine/core/editing/markup.h"
 #include "sky/engine/public/platform/Platform.h"
 
 namespace blink {
 
 struct SameSizeAsShadowRoot : public DocumentFragment, public TreeScope {
     void* pointers[1];
     unsigned countersAndFlags[1];
 };
 
 COMPILE_ASSERT(sizeof(ShadowRoot) == sizeof(SameSizeAsShadowRoot), shadowroot_should_stay_small);
@@ skipping 188 matching lines @@
 
 StyleSheetList* ShadowRoot::styleSheets()
 {
     if (!ensureShadowRootRareData()->styleSheets())
         m_shadowRootRareData->setStyleSheets(StyleSheetList::create(this));
 
     return m_shadowRootRareData->styleSheets();
 }
 
 }