Blink: Replace all "plug-in" with "plugin".

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 11 matching lines @@
 
 #ifndef LayoutEmbeddedObject_h
 #define LayoutEmbeddedObject_h
 
 #include "core/layout/LayoutPart.h"
 
 namespace blink {
 
 class TextRun;
 
-// Renderer for embeds and objects, often, but not always, rendered via plug-ins.
-// For example, <embed src="foo.html"> does not invoke a plug-in.
+// Renderer 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*);
     virtual ~LayoutEmbeddedObject();
 
     enum PluginUnavailabilityReason {
         PluginMissing,
         PluginBlockedByContentSecurityPolicy,
     };
     void setPluginUnavailabilityReason(PluginUnavailabilityReason);
@@ skipping 22 matching lines @@
     bool m_showsUnavailablePluginIndicator;
     PluginUnavailabilityReason m_pluginUnavailabilityReason;
     String m_unavailablePluginReplacementText;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutEmbeddedObject, isEmbeddedObject());
 
 } // namespace blink
 
 #endif // LayoutEmbeddedObject_h