blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/layout/LayoutEmbeddedObject.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010, 2012 Apple Inc.
  *               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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 10 matching lines @@
  *
  */
 
 #ifndef LayoutEmbeddedObject_h
 #define LayoutEmbeddedObject_h
 
 #include "core/layout/LayoutPart.h"
 
 namespace blink {
 
-class TextRun;
-
 // LayoutObject for embeds and objects, often, but not always, rendered via
 // plugins. For example, <embed src="foo.html"> does not invoke a plugin.
 class LayoutEmbeddedObject : public LayoutPart {
  public:
   LayoutEmbeddedObject(Element*);
   ~LayoutEmbeddedObject() override;
 
   enum PluginAvailability {
     PluginAvailable,
     PluginMissing,
@@ skipping 30 matching lines @@
 
   PluginAvailability m_pluginAvailability = PluginAvailable;
   String m_unavailablePluginReplacementText;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutEmbeddedObject, isEmbeddedObject());
 
 }  // namespace blink
 
 #endif  // LayoutEmbeddedObject_h