Don't include headers from the layout API from other headers needlessly.

third_party/WebKit/Source/core/html/HTMLObjectElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 19 matching lines @@
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/TagCollection.h"
 #include "core/dom/Text.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/fetch/ImageResource.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLImageLoader.h"
 #include "core/html/HTMLMetaElement.h"
 #include "core/html/HTMLParamElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
+#include "core/layout/api/LayoutEmbeddedItem.h"
 #include "core/plugins/PluginView.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/Widget.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 inline HTMLObjectElement::HTMLObjectElement(Document& document, HTMLFormElement* form, bool createdByParser)
     : HTMLPlugInElement(objectTag, document, createdByParser, ShouldNotPreferPlugInsForImages)
@@ skipping 375 matching lines @@
 {
     return fastHasAttribute(usemapAttr);
 }
 
 bool HTMLObjectElement::useFallbackContent() const
 {
     return HTMLPlugInElement::useFallbackContent() || m_useFallbackContent;
 }
 
 } // namespace blink