Remove StyleEngine.h include from RenderObject.h

Source/core/html/HTMLElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Motorola Mobility. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 17 matching lines @@
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptEventListener.h"
 #include "core/CSSPropertyNames.h"
 #include "core/CSSValueKeywords.h"
 #include "core/HTMLNames.h"
 #include "core/XMLNames.h"
 #include "core/css/CSSMarkup.h"
 #include "core/css/CSSValuePool.h"
 #include "core/css/StylePropertySet.h"
 #include "core/dom/DocumentFragment.h"
+#include "core/dom/ElementTraversal.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/Text.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/markup.h"
 #include "core/events/EventListener.h"
 #include "core/events/KeyboardEvent.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLBRElement.h"
@@ skipping 901 matching lines @@
 #ifndef NDEBUG
 
 // For use in the debugger
 void dumpInnerHTML(WebCore::HTMLElement*);
 
 void dumpInnerHTML(WebCore::HTMLElement* element)
 {
     printf("%s\n", element->innerHTML().ascii().data());
 }
 #endif